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 0.0000379086 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 0.0000078678 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 0.0000209808 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 0.0000119209 seconds
| Is 28 a Catalan number? | No |
| Is 28 a Fibonacci number? | No |
| Is 28 a Idoneal number? | Yes: I19 |
Calculation was done in 0.0000040531 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 0.0016040802 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 0.0000178814 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 0.0000100136 seconds
Is 28 an Even Number?
Yes, the number 28 is an even number.
Previous even number is
26
Calculation was done in 0.0000030994 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 0.0000021458 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 0.0000810623 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 0.0142159462 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 0.0000269413 seconds
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