79 (number)

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79 (seventy-nine) is the natural number following 78 and preceding 80.

← 70 71 72 73 74 75 76 77 78 79 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	79 seventy-nine
Ordinal	79th seventy-ninth
Factorization	prime
Divisors	1, 79
Roman numeral	LXXIX
Binary	1001111
Hexadecimal	4F

1 In mathematics
2 In science
3 In other fields
4 In sports

In mathematics

Seventy-nine is the 22nd prime number. The next is eighty-three. Seventy-nine is a permutable prime, with ninety-seven. 79 is a Kynea number.

Since 23! + 1 is divisible by 79 but 79 is not one more than a multiple of 23, 79 is a Pillai prime. 79 is the smallest number that can't be represented as a sum of fewer than 19 fourth powers.

79 is a strictly non-palindromic number.

In science

The atomic number of gold.

In astronomy,

Messier object M79, a magnitude 8.5 globular cluster in the constellation Lepus

The New General Catalogue object NGC 79, a galaxy in the constellation Andromeda

The Saros number of the solar eclipse series which began on -434 May 21 and ended on 828 June 16. The duration of Saros series 79 was 1262.1 years, and it contained 71 solar eclipses.

The Saros number of the lunar eclipse series which began on -150 February 16 and ended on 1166 April 12. The duration of Saros series 79 was 1316.2 years, and it contained 74 lunar eclipses.

In other fields

Seventy-nine is also:

Live Seventy Nine, an album by Hawkwind
The year AD 79, 79 BC, or 1979.
The designation of Interstate 79, a freeway that runs from West Virginia to Pennsylvania.
The number of Star Trek: The Original Series episodes, not counting the first pilot, "The Cage", which was enclosed into "The Menagerie".
The number of recommendations in the Iraq Study Group Report.
Elvis Presley holds the Billboard record with 79 cumulative weeks at #1
Asa Long (1904-99) was the oldest United States checkers champion in 1984, at 79
In the UK iTunes Store one song costs 79 pence