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← 50 51 52 53 54 55 56 57 58 59 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 → Cardinal fifty Ordinal 50th (fiftieth) Numeral system quinquagesimal Factorization Divisors 1, 2, 5, 10, 25, 50 Roman numeral L Unicode symbol(s) ↆ Binary 1100102 Octal 628 Duodecimal 4212 Hexadecimal 3216 50 (fifty) is the natural number following 49 and preceding 51. Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In religion 4 In sports 5 In other fields 6 Historical years In mathematics

Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 12 + 72 = 52 + 52. It is also the sum of three squares, 50 = 32 + 42 + 52. It is a Harshad number. There is no solution to the equation φ(x) = 50, making 50 a nontotient. Nor is there a solution to the equation x - φ(x) = 50, making 50 a noncototient. The aliquot sum of 50 is 43 and its aliquot sequence is (50,43,1,0). Fifty is itself the aliquot sum of 40 and 94. Look up fifty in Wiktionary, the free dictionary. In science The atomic number of tin The fifth magic number in nuclear physics Astronomy Messier object M50, a magnitude 7.0 open cluster in the constellation Monoceros The New General Catalogue object NGC 50, a spiral galaxy in the constellation Cetus The Saros number of the solar eclipse series which began on 1201 February BC and ended on 97 April. The duration of Saros series 50 was 1298.1 years, and it contained 73 solar eclipses. The Saros number of the lunar eclipse series which began on 1134 B.C. July 3 and ended on 164 August. The duration of Saros series 50 was 1298.1 years, and it contained 73 lunar eclipses. In religion In Kabbalah, there are 50 Gates of Wisdom (or Understanding) and 50 Gates of Impurity The traditional number of years in a jubilee period In sports The jersey number 50 has been retired by a number of North American sports teams in honor of past playing greats or other figures. In Major League Baseball: The Los Angeles Angels of Anaheim, for coach Jimmie Reese, who served with the team when it was known as the California Angels. In the NBA: The San Antonio Spurs, for Hall of Famer David Robinson. In the NFL: The New York Giants, for Hall of Famer Ken Strong. No NHL team has retired the number, which is not frequently issued. The jersey number 50 has also been retired by the men's basketball program of the University of North Carolina for Tyler Hansbrough. In other fields

Fifty is: There are 50 states in the United States of America. The TV show Hawaii Five-O is so called because Hawaii is the 50th state 5-O (Five-Oh) - Slang for police officers and/or a warning that police are approaching. Derived from the television show Hawaii Five-O A calibre of ammunition (0.50 inches: see .50 BMG) In millimeters, the focal length of the normal lens in 35 mm photography The percentage (50%) equivalent to one half, so that the phrase "fifty-fifty" commonly expresses something divided equally in two; in business this is often denoted as being the ultimate in equal partnership In years of marriage, the gold or "golden" wedding anniversary Nickname 50 Cent, a rapper. The number of chapters in the book of Genesis Kennedy Half Dollar (50 cents) Roman Numeral: L President Ulysses S. Grant is on the U.S. $50 bill “Fifty Degrees Below” book by Kim Stanley Robinson “50 Ways to Leave Your Lover” song by Paul Simon "50 First Dates" movie directed by Peter Segal "Fifty Dead Men Walking" is a 2008 film written and directed by Kari Skogland Fabulous 50s, a nickname for the 1950s decade A Canadian brand of beer called 50 Ale created in 1950 by Labatt breweries to commemorate 50 years of partnership. It is a popular brand still sold today. A 1999 Warren Miller film showcasing skiers and snowboarders at various exotic locations. The number of the French department Manche Historical years

50 A.D., 50 B.C., 1950, 2050, etc.

50 A.D., 50 B.C., 1950, 2050, etc.

50 A.D., 50 B.C., 1950, 2050, etc.

50 A.D., 50 B.C., 1950, 2050, etc.

50 A.D., 50 B.C., 1950, 2050, etc.

50 A.D., 50 B.C., 1950, 2050, etc.