50 (fifty) is the natural number following 49 and preceding 51.
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Cardinal | fifty | |||
Ordinal | 50th (fiftieth) | |||
Numeral system | quinquagesimal | |||
Factorization | 2 × 52 | |||
Divisors | 1, 2, 5, 10, 25, 50 | |||
Greek numeral | Ν´ | |||
Roman numeral | L | |||
Unicode symbol(s) | ↆ | |||
Binary | 1100102 | |||
Ternary | 12123 | |||
Senary | 1226 | |||
Octal | 628 | |||
Duodecimal | 4212 | |||
Hexadecimal | 3216 | |||
Armenian | Ծ | |||
Hebrew | נ / ן | |||
Babylonian numeral | 𒐐 | |||
Egyptian hieroglyph | 𓎊 |
Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 12 + 72 = 52 + 52 (see image). 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.
50 is a Stirling number of the first kind: and also a Narayana 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.
Fifty is the sum of the number of faces that make up the Platonic solids (4 + 6 + 8 + 12 + 20 = 50).
Fifty is:
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