77 (number)

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

<< 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	seventy-seven
Ordinal	77th (seventy-seventh)
Factorization	:<math>7 \cdot 11</math>
Roman numeral	LXXVII
Binary	1001101
Hexadecimal	4D

Contents 1 In mathematics 2 In science 3 In history 4 In other areas

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

• The atomic number of iridium

In astronomy,

Messier object M77, a magnitude 10.5 spiral galaxy in the constellation Cetus

The New General Catalogue object NGC 77, a galaxy in the constellation Cetus

The Saros number 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 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:

• The designation of Interstate 77, a freeway that runs from South Carolina to Ohio.
• The designation of the M77 motorway in the UK which forms the most northerly part of the A77 trunk road which links Glasgow to Stranraer.
• The registry of the U.S. Navy's in-construction nuclear aircraft carrier USS George H. W. Bush (CVN-77), named after U.S. President George H. W. Bush.
• Part of the name of a 50's and 60's era television program: 77 Sunset Strip.
• Part of the name of Talking Heads' first album: Talking Heads: 77.
• The year AD 77, 77 BC, or 1977.

es:Setenta y siete

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