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28

Number 28 (twenty-eight) is an even two-digits composite number and natural number following 27 and preceding 29.

Properties of the number 28

Nominal28
Cardinaltwenty-eight
Ordinal28th
Number of digits2
Sum of digits10
Product of digits16
Number parityEven
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Prime Factorization of 28

Prime factorization2 x 2 x 7
Prime factorization in exponent form22 x 7
Prime factors2, 7
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)3
Sum of prime factors9
Product of prime factors14
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Divisors of 28

List of proper divisors 1, 2, 4, 7, 14
List of all dividers1, 2, 4, 7, 14, 28
Number of divisors d(n)6
Sum of all divisors σ(n)56
Aliquot sum 28
28 is a perfect number, since it is equal to the sum of its proper divisors.
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Prime numbers

Is 28 a prime number?No
Is 28 a semiprime number?No
Is 28 a Chen prime number?No
Is 28 a Mersenne prime number?No
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Sequences

Is 28 a Catalan number?No
Is 28 a Fibonacci number?No
Is 28 a Idoneal number?Yes: I19
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Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
28 is a Happy number
28 is a Humble number
28 is not a Münchhausen number
28 is a Perfect number
28 is not a Perfect square
28 is not a Palindrome
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Numeric Bases of 28

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.
BaseSystemValue
2Binary111002
3Ternary10013
4Quaternary1304
5Quinary1035
6Senary446
7Septenary407
8Octal348
9Nonary319
10Decimal28
12Duodecimal2412
16Hexadecimal1c16
20Vigesimal1820
36Base36s36
60SexagesimalS60
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Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
Square of 28 (n2)784
Cube of 28 (n3)21952
Square root of 285.2915026221292
Natural Logarithm (ln) of 283.3322045101752
Decimal Logarithm (log) of 281.4471580313422
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Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 280.27090578830787
Cosecant of 283.6913201679676
Cosine of 28-0.96260586631357
Secant of 28-1.0388467751912
Tangent of 28-0.28142960456427
Cotangent of 28-3.5532864481272
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Number parity

Parity is the property of an integer of whether it is even or odd.

Is 28 an Even Number?

Yes, the number 28 is an even number.

Is 28 an Odd Number?

No
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Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".
The spelling of 28 in words is "twenty-eight", meaning that:
28 is an aban number (a number without the letter a)
28 is not an eban number (as it contains the letter e)
28 is not an iban number (as it contains the letter i)
28 is an oban number (a number without the letter o)
28 is not a tban number (as it contains the letter t)
28 is an uban number (a number without the letter u)
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Numeral systems

How to write 28 in other number systems?
Bengali numerals২৮
Eastern Arabic numerals٢٨
Hieroglyphs numeralsused in Ancient Egypt𓎇𓐁
Khmer numerals២៨
Japanese numerals二十八
Roman numeralsXXVIII
Thai numerals๒๘
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Translation

How do you say 28 in 38 different languages?
Arabicثمانية و عشرون
Croatiandvadeset i osam
Czechdvacet osm
Danish otte og tyve
Dutchachtentwintig
Estonianblaeve vɔ enyi
Faroesetjúgo­átta
Filipinodalawáng pû’t waló
Finnishkaksi­kymmentä­kahdeksan
Frenchvingt-huit
Greekείκοσι οκτώ
Germanacht­und­zwanzig
Hebrewעשרים ושמונה
Hindiअट्ठाईस
Hungarianhuszon­nyolc
Icelandictuttugu og átta
Indonesiandua puluh delapan
Italianventotto
Japanese二十八
Korean이십팔
Latviandivdesmit astoņi
Lithuaniandvidešimt aštuoni
Norwegiantjue­åtte
Persianبیست و هشت
Polishdwadzieścia osiem
Portuguesevinte e oito
Romaniandouăzeci şi opt
Russianдвадцать восемь
Serbianдвадесет и осам
Slovakdvadsať­osem
Slovenedvaset osem
Spanish veintiocho
Swahiliishirini na nane
Swedishtjugoåtta
Thaiยี่​สิบ​แปด
Turkishyirmi sekiz
Ukrainianдвадцять вісім
Vietnamesehai mươi tám
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Miscellaneous

Number 28 reversed82
ASCII Code28
Unicode CharacterU+001C
Unix TimestampThu, 01 Jan 1970 00:00:28 +0000
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