Number reference
50 explained.
50: fifty, composite; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- fifty
- Classification
- composite
- Factors
- 1, 2, 5, 10, 25, 50
- Prime factorization
- 2 × 5 × 5
- Square root
- 7.071068
- Cube root
- 3.684031
- Binary
- 110010
- Octal
- 62
- Hexadecimal
- 32
- Roman numeral
- L
- Digit sum
- 5
- Digital root
- 5
What makes 50 notable
- Factor structure. 50 breaks down into 2 distinct primes (2, 5) and has 6 divisors in total, so it can be split into equal whole-number groups 4 ways beyond 1 and itself.
50 in everyday use
Fifty stars on the American flag stand for fifty states, the last two added in 1959. It is the atomic number of tin, the Roman numeral L, and half a century. A fiftieth anniversary is golden. Mains electricity runs at 50 hertz across Europe, Asia, Africa, and Australia, against 60 in the Americas. The urban speed limit in most of Europe is 50 kilometres per hour, and a fifty-cent piece is a half dollar.
Fifty is the smallest number that can be written as the sum of two squares in two different ways: 1 + 49 and 25 + 25. It factors as 2 × 5² and has six divisors. Fifty is also the sum of three squares, 9 + 16 + 25, the squares of the 3-4-5 triangle. In binary it is 110010.
Nearby numbers
How to read this page
The factor list shows every way 50 splits into equal whole-number groups — 6 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 50 for contexts that do not use decimal.
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