78 number: Encyclopedia - 78 number

78 (number)

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

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

List of numbers -- Integers

0 10 20 30 40 50 60 70 80 90 >>

78 number - 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 ( ), at a minimum, are required to fill a rectangle.

78 number - In science

• The atomic number of platinum

In astronomy,

78 number - In other fields

78 is also:

• The designation of Interstate 78, a freeway that runs from Pennsylvania to New York.
• In reference to gramophone records, 78 refers those meant to be spun at 78 revolutions per minute. Compare: LP, 33 and 45. During the 1970s and 1980s some prostitutes took to describing clients who ejaculated quickly as 78s, reflecting the fact those records spin more quickly than others. The slang is now reported to have fallen into disuse.
• A standard Tarot deck containing the 22 cards of the major arcana (including the fool) and the 56 cards of the minor arcana make up 78 cards.
• The number of the French département Yvelines
• The total number of gifts in the song The Twelve Days of Christmas (since 78 is the 12th triangular number).
• The year AD 78, 78 BC, or 1978.
• The number of lines that make up Metatron's Cube.

Adapted from the Wikipedia article "78 number", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki