27 (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.


Cardinal	twenty-seven
Ordinal	twenty-seventh
Factorization	$3^3 \,\!$
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 science

The atomic number of cobalt

In astronomy,

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.

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 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

2 7 2 7

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