Number reference
58 explained.
58: fifty-eight, composite; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- fifty-eight
- Classification
- composite
- Factors
- 1, 2, 29, 58
- Prime factorization
- 2 × 29
- Square root
- 7.615773
- Cube root
- 3.870877
- Binary
- 111010
- Octal
- 72
- Hexadecimal
- 3A
- Roman numeral
- LVIII
- Digit sum
- 13
- Digital root
- 4
What makes 58 notable
- Semiprime. 58 = 2 × 29, a product of exactly two primes. That gives it just four divisors, so it splits into equal groups in only two non-trivial ways.
58 in everyday use
Fifty-eight is the atomic number of cerium, the most abundant of the rare-earth metals, used in lighter flints, glass polishing, and self-cleaning oven coatings. Cerium was identified in 1803 and named after Ceres, the dwarf planet discovered two years earlier. Venezuela's international dialling code is +58, and in Britain the M58 motorway links Liverpool with the M6 near Wigan. The 1958 World Cup in Sweden, where a seventeen-year-old Pelé scored in the final, is the tournament that made him famous.
Fifty-eight is the sum of the first seven primes, 2 + 3 + 5 + 7 + 11 + 13 + 17, and the sum of two squares, 9 + 49. It is a Smith number: its digits add to 13, and so do the digits of its prime factors 2 and 29. Fifty-eight is 2 × 29 and has four divisors. In binary it is 111010.
Nearby numbers
How to read this page
The factor list shows every way 58 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 58 for contexts that do not use decimal.
Percentage calculator · Fraction calculator · Browse Number Explorer