77 (number)

77 is the natural number following 76 and preceding 78. Seventy-seven is the smallest positive integer requiring five syllables in English.

List of numbersIntegers

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

Cardinal seventy-seven
Ordinal77th (seventy-seventh)
Factorization:<math>7 \cdot 11<math>
Roman numeralLXXVII
Binary1001101
Hexadecimal4D
Contents

In mathematics

Seventy-seven is the sum of three squares, 42 + 52 + 62, as well as the sum of the first eight prime numbers.

In science

In astronomy,

Messier object M77, a magnitude 10.5 spiral galaxy in the constellation Cetus
The New General Catalogue object (http://www.ngcic.org/) NGC 77, a galaxy in the constellation Cetus
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -474 July 11 and ended on 788 August 6. The duration of Saros series 77 was 1262.1 years, and it contained 71 solar eclipses.
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -190 April 9 and ended on 1090 May 16. The duration of Saros series 77 was 1280.1 years, and it contained 72 lunar eclipses.

In history

During World War II in Sweden at the border with Norway, "77" was used as a Shibboleth (password), because the tricky pronunciation in Swedish made it easy to instantly discern whether the speaker was native Swedish, Norwegian, or German.

In other areas

Seventy-seven is also:

es:Setenta y siete

ko:77 ia:77 it:Settantasette ja:77 sl:77 (število) sv:77 (tal) zh:77

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