27 (number)
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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 number not divisible by any of its digits.
| Cardinal | twenty-seven |
| Ordinal | twenty-seventh |
| Factorization | <math>3^3 \,\!<math> |
| Roman numeral | XXVII |
| Binary | 11011 |
| Hexadecimal | 1B |
| Contents |
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-eighth (and twenty-ninth) digit in π. (3.141592653589793238462643383279502884197169399375105820974944592).
A 10,000-day-old person is 27 years old (and some months).
In astronomy
- The Messier object M27, a magnitude 7.5 planetary nebula in the constellation Vulpecula, also known as the Dumbbell Nebula.
- The New General Catalogue object NGC 27, a spiral galaxy in the constellation Andromeda
- The Saros number of the solar eclipse series which began on -1993 March 9 and ended on -713 April 16. The duration of Saros series 27 was 1280.1 years, and it contained 72 solar eclipses. Further, the Saros number of the lunar eclipse series which began on -1944 July 17 and ended on -411 January 23. The duration of Saros series 27 was 1532.5 years, and it contained 86 lunar eclipses.
- The 27th moon of Jupiter is Sinope.
In other fields
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 musicans Robert Johnson, 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.
- With the number 37, a key number in comedian Charles Fleischer's concept of moleeds (http://www.monkeydog.com/moleeds/).
- I-27 is the designation for a US interstate highway in Texas.
- Historical years: 27 A.D., 27 B.C., or 1927
External link
- The homepage of Jonathan J. Harris number27.org (http://www.number27.org/)
- The Mystery of the number 27 chrismore.com/projectx/27 (http://www.chrismore.com/projectx/27/)es:Veintisiete
eo:Dudek sep fr:27 (nombre) ko:27 ia:27 it:Ventisette he:27 (מספר) nl:27 (getal) ja:27 no:27 (tall) pt:Vinte e sete sl:27 (število) sv:27 (tal) zh:27