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.
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| Cardinal | seventy-seven | ||
| Ordinal | 77th (seventy-seventh) | ||
| Factorization | :<math>7 \cdot 11<math> | ||
| Roman numeral | LXXVII | ||
| Binary | 1001101 | ||
| Hexadecimal | 4D | ||
| 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
- 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 (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:
- The designation of Interstate 77, a freeway that runs from South Carolina to Ohio.
- 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 televsion program: 77 Sunset Strip.
- The year AD 77, 77 BC, or 1977.
ko:77 ia:77 it:Settantasette ja:77 sl:77 (število) sv:77 (tal) zh:77