73 (number)

73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest integer with twelve letters in its spelled out name.


Cardinal	73 seventy-three
Ordinal	73rd seventy-third
Factorization	prime
Roman numeral	LXXIII
Binary	1001001
Hexadecimal	49

In mathematics

Seventy-three is the 21st prime number. The previous is seventy-one, with which it comprises a twin prime. It is also a permutable prime with thirty-seven. 73 is a star number.

Every positive integer is the sum of at most 73 sixth powers (see Waring's problem).

In base 5, the smallest prime with a composite sum of digits is 73.

73 is a repdigit in base 8 (111).

In science

The atomic number of tantalium

In astronomy,

Messier object M73, a magnitude 9.0 apparent open cluster in the constellation Aquarius

The New General Catalogue object NGC 73, a barred spiral galaxy in the constellation Cetus

The Saros number of the solar eclipse series which began on 717 BC July 16 and ended on 582 September 3. The duration of Saros series 73 was 1298.1 years, and it contained 73 solar eclipses.

In other fields

Seventy-three is also:

The total number of books in the Holy Bible in the Catholic version if the Book of Lamentations is counted as a book separate from the Book of Jeremiah.
The designation of USA Interstate 73, a freeway in North Carolina.
The registry of the U.S. Navy's nuclear aircraft carrier USS George Washington (CVN-73), named after U.S. President George Washington.
The best-known car number of retired NASCAR driver Phil Barkdoll.
In baseball, the single-season home run record set by Barry Bonds in 2001.
The year AD 73, 73 BC, or 1973.
Amateur radio operators often use the number 73 as a way of saying "best regards" (typically when ending a QSO). ^*
- 73 was an amateur radio magazine published by Wayne Green (who also started Byte magazine).
Each of the five seasons of the Discordian calendar has 73 days.

Integers

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In mathematics

In science

In other fields