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".


Cardinal	27 twenty-seven
Ordinal	27th twenty-seventh
Factorization	$3^3 \,\!$
Roman numeral	XXVII
Acrophonic Greek numeral	ΔΔΠΙΙ
Alphabetic Greek numeral	κζ´
Hebrew numeral	כז
Chinese numeral	二十七
Financial Chinese numeral	貳拾柒
Arabic numeral
Binary (2)	11011
Negabinary (-2)	1101111
Ternary (3)	1000
Balanced ternary (-0+)	1000
Negaternary (-3)	12000
Quaternary (4)	123
Quinary (5)	102
Senary (6)	43
Septenary (7)	36
Octal (8)	33
Nonary (9)	30
Decimal (10)	27
Undecimal (11)	25
Duodecimal (12)	23
Tridecimal (13)	21
Hexadecimal (16)	1B
Vigesimal (20)	17
Quadrovigesimal (24)	13
Septemvigesimal (27)	10
Trigesimal (30)	R
Hexatridecimal (36)	R
Phinary (φ)	1010010.010101 111101.10111111

In mathematics

Twenty-seven is a perfect cube, being 3³ = 3 × 3 × 3. 27 is 3↑↑2 (using Knuth's up-arrow notation). There are exactly 27 straight lines on a cubic surface. 27 is also a decagonal number.

In base 10, it is the first composite number not evenly divisible by any of its digits. It is the radix (base) of the septemvigesimal positional numeral system.

In a prime reciprocal magic square of the multiples of 1/7, the magic constant is 27. It is the twenty-eighth (and twenty-ninth) digit in π. (3.141592653589793238462643383279).

In base 10, it is a Smith number and a Harshad number.

The unique simple formally real Jordan algebra, the exceptional Jordan algebra of self-adjoint 3 by 3 matrices of quaternions, is 27-dimensional.

In science

The atomic number of cobalt.

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 religion

There are a total of 27 books in the New Testament
The total number of letters in the Hebrew alphabet (22 regular letters and 5 final consonants)

In music

The number of completed, numbered piano concertos by Wolfgang Amadeus Mozart
The age in years at which many famous rock musicians died, sometimes referred to as the 27 Club. Occasionally, this is termed the "ideal" age to die, and the concept has inspired a brand of clothing, DeadAt27
A number which "Weird Al" Yankovic hides somewhere in many of his songs and videos here
The name of the second track on, and first single released from, the Biffy Clyro album Blackened Sky

In other fields

Twenty-seven is also:

The number of letters in the Spanish alphabet
Rusty Wallace's car number when he won the 1989 NASCAR Winston Cup championship.
The current number of Amendments to the United States Constitution.
The modal age of the peak peformance year for major league baseball position players, according to a commonly accepted theory by sabermetrician Bill James
The code for international direct-dial phone calls to South Africa
With the number 37, a key number in comedian Charles Fleischer's concept of moleeds
The designation (I-27) of a US interstate highway in Texas
The designation (US 27) of a United States national highway from Fort Wayne, Indiana to Miami, Florida
Considered the Saint-Supreme-Number by Quozers (followers of the Quoze's lifestyle
The name of a popular cigarette, Marlboro Blend No. 27
The number of books in the first Xanth "trilogy"

Historical years

27 A.D., 27 B.C., 1927, 2027, etc.

External links

Integers | In-jokes

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