The 72 (number) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

72 (number)

72 is the natural number following 71 and preceding 73.

List of numbers — Integers << 70 71 72 73 74 75 76 77 78 79 >>
Cardinal	seventy-two
Ordinal	72nd (seventy-second)
Factorization
Divisors	2, 3, 4, 6, 8, 9, 12, 18, 24, 36
Roman numeral	LXXII
Binary	1001000
Hexadecimal	48

Mathematics

Seventy-two is the sum of four consecutive primes (13 + 17 + 19 + 23), as well as the sum of six consecutive primes (5 + 7 + 11 + 13 + 17 + 19). It is a highly composite number.

In normal space, the exterior angles of an equilateral pentagon measure 72 degrees each.

Other fields

Seventy-two is also:

• The atomic number of hafnium.
• The total number of books in the Holy Bible in the Catholic version if the Book of Lamentations is considered part of the Book of Jeremiah.
• The designation of USA Interstate 72, a freeway that runs from Missouri to Illinois.
• The number of the French department Sarthe.
• The registry of the U.S. Navy's nuclear aircraft carrier USS Abraham Lincoln (CVN-72), named after U.S. President Abraham Lincoln.
• The designation of the Soviet T-72 tank.
• The number of hours in three days.
• The year AD 72, 72 BC, or 1972.

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