Number reference
74 explained.
74: seventy-four, composite; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- seventy-four
- Classification
- composite
- Factors
- 1, 2, 37, 74
- Prime factorization
- 2 × 37
- Square root
- 8.602325
- Cube root
- 4.198336
- Binary
- 1001010
- Octal
- 112
- Hexadecimal
- 4A
- Roman numeral
- LXXIV
- Digit sum
- 11
- Digital root
- 2
What makes 74 notable
- Semiprime. 74 = 2 × 37, a product of exactly two primes. That gives it just four divisors, so it splits into equal groups in only two non-trivial ways.
74 in everyday use
Seventy-four is the atomic number of tungsten, the metal with the highest melting point of any element, which is why it glowed in light-bulb filaments for a century. The original compact disc specification held 74 minutes of audio, a length said to have been chosen to fit Beethoven's Ninth Symphony. Tungsten's chemical symbol, W, comes from wolfram, the metal's older German name.
Seventy-four is 2 × 37 and the sum of two squares, 25 + 49. It is a nontotient: no whole number has exactly 74 smaller numbers coprime to it. Its digits sum to 11, and in binary it is 1001010. It has four divisors, 1, 2, 37, and 74, and its reversal, 47, is prime.
Nearby numbers
How to read this page
The factor list shows every way 74 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 74 for contexts that do not use decimal.
Percentage calculator · Fraction calculator · Browse Number Explorer