75

75 (seventy-five) is the natural number following 74 and preceding 76.

← 74 76 → 75
← 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-five
Ordinal	75th (seventy-fifth)
Numeral system	75
Factorization
Divisors	1, 3, 5, 15, 25, 75
Roman numeral	LXXV
Binary	10010112
Octal	1138
Duodecimal	6312
Hexadecimal	4B16

In mathematics

As the sum of the first five pentagonal numbers, seventy-five is a pentagonal pyramidal number. It is also an enneagonal number.

It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75... But there is no integer that added up to its own digits adds up to 75, hence 75 is a self number.

Excluding the infinite sets, there are 75 uniform polyhedra (or 76 if edges are allowed to coincide).

In astronomy

Messier object M75, a magnitude 9.5 globular cluster in the constellation Sagittarius

The New General Catalogue object NGC 75, a spiral galaxy in the constellation Pisces

In geography

• Municipal Okrug 75, a municipal okrug of Frunzensky District of Saint Petersburg, Russia
• The number of the French department Paris, and thus the first two digits of the postal code for the city of Paris

In other fields

Seventy-five is also:

• Diamond anniversary
• The atomic number of rhenium
• The age limit for Canadian senators
• A car model name used by the MG Rover Group, called the Rover 75
• The designation of Interstate 75, a US freeway that runs from Florida to Michigan
• The registry of the U.S. Navy's nuclear aircraft carrier USS Harry S. Truman (CVN-75), named after U.S. President Harry S. Truman
• The record for most game show wins, held by Ian Lygo. Also, the record for most game show appearances, currently a tie between Lygo and Ken Jennings
• A common name used for the Canon de 75 modèle 1897, a famous French artillery piece used throughout World War I
• Sweet 75, a band, and self-titled CD
• Peter, Paul and Mary song "75 Septembers" on their LifeLines CD
• Relient K song "High of 75" on their MMHMM CD
• 75, a song by Big Sur
• Airport 1975 movie
• Jackie Gleason in 1985 found 75 "lost" episodes of "The Honeymooners" (from 1952 and 1955)
• Cheeta the chimpanzee of "Tarzan the Ape Man" is the world's oldest non human primate at 75 in 2007
• Halley's Comet seen every 75–76 years
• CZ 75, the Czech pistol.
• The number of counties in the USA state of Arkansas.
• 75 BC, 75, or 1975.

In sports

• Heavyweight boxer Larry Holmes had a 69-6 record in 75 bouts

• Duke University football player Drew Strojny wore #75

• Famed American Softball Player Brian Roll wears number 75. He plays out of Rush City, MN.

NFL

• Pittsburgh Steelers Mean Joe Greene wore #75
• Green Bay Packers Forrest Gregg wore #75

• Arizona Cardinals Levi Brown wears #75
• Detroit Lions Shaun Cody wears #75
• Cincinnati Bengals Scott Kooistra wears #75
• Seattle Seahawks Sean Locklear wears #75
• Tennessee Titans Benji Olson wears #75
• San Francisco 49ers Spencer Best wears #75
• Howie Long wore #75 during his hall of fame career.

MLB

• San Francisco Giants Barry Zito wears #75
• New York Mets closer Francisco Rodríguez currently wears number 75.