Number reference
82 explained.
82: eighty-two, composite; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- eighty-two
- Classification
- composite
- Factors
- 1, 2, 41, 82
- Prime factorization
- 2 × 41
- Square root
- 9.055385
- Cube root
- 4.344481
- Binary
- 1010010
- Octal
- 122
- Hexadecimal
- 52
- Roman numeral
- LXXXII
- Digit sum
- 10
- Digital root
- 1
What makes 82 notable
- Semiprime. 82 = 2 × 41, a product of exactly two primes. That gives it just four divisors, so it splits into equal groups in only two non-trivial ways.
82 in everyday use
Eighty-two is the atomic number of lead, the heaviest element with stable isotopes, which is why chains of radioactive decay from uranium and thorium all end in lead. The NBA and NHL regular seasons each run to 82 games. Lead's chemical symbol, Pb, comes from the Latin plumbum, which also gave English the words plumber and plumb line.
Eighty-two is 2 × 41 and the sum of two squares, 81 + 1. It is a happy number: 64 + 4 = 68, then 36 + 64 = 100, then 1. It is the number of distinct hexagonal polyforms of six cells, and it has four divisors. In binary it is 1010010, and its digits sum to 10.
Nearby numbers
How to read this page
The factor list shows every way 82 splits into equal whole-number groups — 4 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 82 for contexts that do not use decimal.
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