78 (number)

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78 (seventy-eight) is the natural number following 77 and followed by 79.

List of numbersIntegers

<< 70 71 72 73 74 75 76 77 78 79 >>

Cardinal seventy-eight
Ordinal78th (seventy-eighth)
Factorization<math>2 \cdot 3 \cdot 13<math>
Divisors 2, 3, 6, 13, 26, 39
Roman numeralLXXVIII
Binary1001110
Hexadecimal4E

In mathematics

78 is a triangular number, and its factorization makes it a sphenic number.

Karl A. Dahlke proved in 1989 that 78 heptominos of this shape ( Missing image
Heptomino-78.png
image:heptomino-78.png

), at a minimum, are required to fill a rectangle.

In science

In astronomy,

Messier object M78, a magnitude 8.0 diffuse nebula in the constellation Orion
The New General Catalogue object (http://www.ngcic.org/) NGC 78, a magnitude 12.8 barred spiral galaxy in the constellation Pisces
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -463 June 9 and ended on 817 July 18. The duration of Saros series 78 was 1280.1 years, and it contained 72 solar eclipses.
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -125 April 10 and ended on 1155 May 18. The duration of Saros series 78 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

78 is also:

eo:Sepdek ok ko:78 ia:78 it:Settantotto ja:78 sl:78 (število) sv:78 (tal) zh:78

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