This article discusses the number fifty. For the year 50 CE, see 50. For other uses of 50, see 50 (disambiguation)
50  

Cardinal  fifty 
Ordinal  50th (fiftieth) 
Numeral system  quinquagesimal 
Factorization  
Divisors  1, 2, 5, 10, 25, 50 
Roman numeral  L 
Binary  110010_{2} 
Octal  62_{8} 
Duodecimal  42_{12} 
Hexadecimal  32_{16} 
50 (fifty) is the natural number following 49 and preceding 51.
Contents 
Fifty is the smallest number that is the sum of two nonzero square numbers in two distinct ways: 50 = 1^{2} + 7^{2} = 5^{2} + 5^{2}. It is also the sum of three squares, 50 = 3^{2} + 4^{2} + 5^{2}. 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.
Fifty is:
50 A.D., 50 B.C., 1950, 2050, etc.
