28
Number 28 (twenty-eight) is an even two-digits composite number and natural number following 27 and preceding 29.
Nominal | 28 |
Cardinal | twenty-eight |
Ordinal | 28th |
Number of digits | 2 |
Sum of digits | 10 |
Product of digits | 16 |
Number parity | Even |
Calculation was done in 0.0000391006 seconds
Prime factorization | 2 x 2 x 7 |
Prime factorization in exponent form | 22 x 7 |
Prime factors | 2, 7 |
Number of distinct prime factors ω(n) | 2 |
Total number of prime factors Ω(n) | 3 |
Sum of prime factors | 9 |
Product of prime factors | 14 |
Calculation was done in 0.0000100136 seconds
List of proper divisors | 1, 2, 4, 7, 14 |
List of all dividers | 1, 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. |
Calculation was done in 0.0000259876 seconds
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 |
Calculation was done in 0.0000128746 seconds
Is 28 a Catalan number? | No |
Is 28 a Fibonacci number? | No |
Is 28 a Idoneal number? | Yes: I19 |
Calculation was done in 0.0000050068 seconds
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 |
Calculation was done in 0.0016198158 seconds
Base | System | Value |
---|
2 | Binary | 111002 |
3 | Ternary | 10013 |
4 | Quaternary | 1304 |
5 | Quinary | 1035 |
6 | Senary | 446 |
7 | Septenary | 407 |
8 | Octal | 348 |
9 | Nonary | 319 |
10 | Decimal | 28 |
12 | Duodecimal | 2412 |
16 | Hexadecimal | 1c16 |
20 | Vigesimal | 1820 |
36 | Base36 | s36 |
60 | Sexagesimal | S60 |
Calculation was done in 0.0000169277 seconds
Square of 28 (n2) | 784 |
Cube of 28 (n3) | 21952 |
Square root of 28 | 5.2915026221292 |
Natural Logarithm (ln) of 28 | 3.3322045101752 |
Decimal Logarithm (log) of 28 | 1.4471580313422 |
Calculation was done in 0.0000050068 seconds
Sine of 28 | 0.27090578830787 |
Cosecant of 28 | 3.6913201679676 |
Cosine of 28 | -0.96260586631357 |
Secant of 28 | -1.0388467751912 |
Tangent of 28 | -0.28142960456427 |
Cotangent of 28 | -3.5532864481272 |
Calculation was done in 0.0000109673 seconds
Is 28 an Even Number?
Yes, the number 28 is an even number.
Previous even number is
26
Calculation was done in 0.0000040531 seconds
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) |
Calculation was done in 0.0000028610 seconds
Bengali numerals | ২৮ |
Eastern Arabic numerals | ٢٨ |
Hieroglyphs numeralsused in Ancient Egypt | 𓎇𓐁 |
Khmer numerals | ២៨ |
Japanese numerals | 二十八 |
Roman numerals | XXVIII |
Thai numerals | ๒๘ |
Calculation was done in 0.0000720024 seconds
Arabic | ثمانية و عشرون |
Croatian | dvadeset i osam |
Czech | dvacet osm |
Danish | otte og tyve |
Dutch | achtentwintig |
Estonian | blaeve vɔ enyi |
Faroese | tjúgoátta |
Filipino | dalawáng pû’t waló |
Finnish | kaksikymmentäkahdeksan |
French | vingt-huit |
Greek | είκοσι οκτώ |
German | achtundzwanzig |
Hebrew | עשרים ושמונה |
Hindi | अट्ठाईस |
Hungarian | huszonnyolc |
Icelandic | tuttugu og átta |
Indonesian | dua puluh delapan |
Italian | ventotto |
Japanese | 二十八 |
Korean | 이십팔 |
Latvian | divdesmit astoņi |
Lithuanian | dvidešimt aštuoni |
Norwegian | tjueåtte |
Persian | بیست و هشت |
Polish | dwadzieścia osiem |
Portuguese | vinte e oito |
Romanian | douăzeci şi opt |
Russian | двадцать восемь |
Serbian | двадесет и осам |
Slovak | dvadsaťosem |
Slovene | dvaset osem |
Spanish | veintiocho |
Swahili | ishirini na nane |
Swedish | tjugoåtta |
Thai | ยี่สิบแปด |
Turkish | yirmi sekiz |
Ukrainian | двадцять вісім |
Vietnamese | hai mươi tám |
Calculation was done in 0.0140647888 seconds
Number 28 reversed | 82 |
ASCII Code | 28 | |
Unicode Character | U+001C | |
Unix Timestamp | Thu, 01 Jan 1970 00:00:28 +0000 |
Calculation was done in 0.0000250340 seconds
This page was generated in 0.02 seconds.