number
27 (twenty-seven) is the natural number following 26 and preceding 28. Twenty-seven is the smallest positive integer requiring four syllables to name in English, though it can be unambiguously defined in just two: "three cubed". It is the first composite integer not divisible by any of its digits.
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| Cardinal | twenty-seven | ||
| Ordinal | twenty-seventh | ||
| Factorization | 
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| Roman numeral | XXVII | ||
| Binary | 11011 | ||
| Hexadecimal | 1B | ||
In mathematics
Twenty-seven is a perfect cube, being 33 = 3 × 3 × 3. 27 is 3↑↑2 (using Knuth's up-arrow notation). It is also a decagonal number. It is the magic result of a prime reciprocal magic square of the multiples of 1/7. It is a Smith number and a Harshad number. It is the twenty-seventh (and twenty-eighth) digit in π. (3.141592653589793238462643383279502884197169399375105820974944592).
A 10,000-day-old person is 27 years old (and some months).
In other fields
The 27th moon of Jupiter is Sinope.
Twenty-seven is also:
- The atomic number of cobalt.
- The total number of books in the New Testament of the Holy Bible.
- The number of letters in the Spanish alphabet
- The current number of Amendments to the United States Constitution.
- The age in years at which rock music stars Jim Morrison, Jimi Hendrix, Brian Jones, Janis Joplin and Kurt Cobain died.
- The code for international direct-dialed phone calls to South Africa.
- "Weird Al" Yankovic hides the number 27 somewhere in many of his songs and videos.
- I-27 is the designation for a US interstate highway in Texas.
- Historical years: 27 A.D., 27 B.C., or 1927
es:Veintisiete ia:27 it:Ventisette ja:27 no:27 (tall) pt:Vinte e sete sl:27 (število) zh:27
Categories: Integers | Composite numbers