54 (number) explained

Number:	54
Divisor:	1, 2, 3, 6, 9, 18, 27, 54

54 (fifty-four) is the natural number following 53 and preceding 55.

In mathematics

• 54 is an abundant number and a semiperfect number, like all other multiples of 6.^[1]
• It is twice the third power of three, 3 + 3 = 54, and hence is a Leyland number.^[2]
• 54 is the smallest number that can be written as the sum of three positive squares in more than two different ways: = = = 54.
• It is a 19-gonal number,^[3]
• In base 10, 54 is a Harshad number.^[4]
• The Holt graph has 54 edges.
• The sine of an angle of 54 degrees is half the golden ratio.
• The number of primes ≤ 2⁸.^[5]
• A Lehmer-Comtet number.^[6]
• 54 is the only non-trivial Neon Number in Power 9: 54⁹ = 3,904,305,912,313,344; 3 + 9 + 0 + 4 + 3 + 0 + 5 + 9 + 1 + 2 + 3 + 1 + 3 + 3 + 4 + 4 = 54

In science

• The atomic number of xenon is 54.

Astronomy

• Messier object M54, a magnitude 8.5 globular cluster in the constellation Sagittarius
• The New General Catalogue object NGC 54, a spiral galaxy in the constellation Cetus
• The number of years in three Saros cycles of eclipses of the sun and moon is known as a Triple Saros or exeligmos (Greek: "turn of the wheel").

In sports

• Fewest points in an NBA playoff game: Chicago (96), Utah (54), June 7, 1998
• The New York Rangers won the Stanley Cup in 1994, 54 years after their previous Cup win. It is the longest drought in the trophy's history.
• For years car number 54 was driven by NASCAR's Lennie Pond. More recently, it is known as the Nationwide Series car number for Kyle Busch.
• A score of 54 on a par 72 course in golf is colloquially referred to as a perfect round. This score has never been achieved in competition.
• The number used when a player is defeated 3 games in a row in racquetball.

In other fields

54 is also:

• +54 The code for international direct dial phone calls to Argentina
• A broadcast television channel number
• 54, a 1998 film about Studio 54 starring Ryan Phillippe, Mike Myers, and Salma Hayek
• 54, a novel by the Wu Ming collective of authors
• In the title of a 1960s television show Car 54, Where Are You?
• The number of the French department Meurthe-et-Moselle
• New York's Warwick New York Hotel is on West 54th Street
• The number of cards in a deck of playing cards, if two jokers are included
• The number of countries in Africa
• Year identifier used on motor vehicles registered in the UK between 1 September 2004 and 28 February 2005

See also

• List of highways numbered 54

Notes and References

1. Web site: Sloane's A005835 : Pseudoperfect (or semiperfect) numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-30.
2. Web site: Sloane's A076980 : Leyland numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-30.
3. Web site: Sloane's A051871 : 19-gonal numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-30.
4. Web site: Sloane's A005349 : Niven (or Harshad) numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-30.
5. A007053. Number of primes <= 2^n. 2022-06-02.
6. A005727. n-th derivative of x^x at x=1. Also called Lehmer-Comtet numbers.