50 (number)

← 49 50 51 →
← 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	2 × 52
Divisors	1, 2, 5, 10, 25, 50
Roman numeral	L
Unicode symbol(s)	ↆ
Binary	1100102
Ternary	12123
Quaternary	3024
Quinary	2005
Senary	1226
Octal	628
Duodecimal	4212
Hexadecimal	3216
Vigesimal	2A20
Base 36	1E36

50 (fifty) is the natural number following 49 and preceding 51.

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, and the sum of four squares, 50 = 6² + 3² + 2² + 1². 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 Nonients.

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:

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