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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 |
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 (see image). [1] 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. [2]
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. [3] Nor is there a solution to the equation x − φ(x) = 50, making 50 a noncototient. [4]
Fifty is the sum of the number of faces that make up the Platonic solids (4 + 6 + 8 + 12 + 20 = 50).
Fifty is:
21 (twenty-one) is the natural number following 20 and preceding 22.
45 (forty-five) is the natural number following 44 and preceding 46.
90 (ninety) is the natural number following 89 and preceding 91.
36 (thirty-six) is the natural number following 35 and preceding 37.
54 (fifty-four) is the natural number following 53 and preceding 55.
114 is the natural number following 113 and preceding 115.
100 or one hundred is the natural number following 99 and preceding 101.
360 is the natural number following 359 and preceding 361.
400 is the natural number following 399 and preceding 401.
144 is the natural number following 143 and preceding 145.
666 is the natural number following 665 and preceding 667.
500 is the natural number following 499 and preceding 501.
555 is the natural number following 554 and preceding 556.
720 is the natural number following 719 and preceding 721.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
800 is the natural number following 799 and preceding 801.
900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.
10,000 is the natural number following 9,999 and preceding 10,001.
5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. It has garnered attention throughout history in part because distal extremities in humans typically contain five digits.