Number reference
44 explained.
44: forty-four, composite, repdigit; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- forty-four
- Classification
- composite
- Factors
- 1, 2, 4, 11, 22, 44
- Prime factorization
- 2 × 2 × 11
- Square root
- 6.63325
- Cube root
- 3.530348
- Binary
- 101100
- Octal
- 54
- Hexadecimal
- 2C
- Roman numeral
- XLIV
- Digit sum
- 8
- Digital root
- 8
What makes 44 notable
- Repdigit. 44 is written with a single repeated digit, so it is divisible by the repunit of the same length.
44 in everyday use
Forty-four is the atomic number of ruthenium, a rare platinum-group metal used to harden alloys and coat electrical contacts. Barack Obama was the 44th President of the United States. The .44 Magnum revolver became a film icon in Dirty Harry in 1971. Forty-four is a common international dialling code: it belongs to the United Kingdom, so British numbers abroad begin +44.
Forty-four is a palindrome and a repdigit, 4 × 11. It is the number of derangements of five objects — the ways to shuffle five letters into five envelopes so that none lands in the right one. It is also an octahedral number, following 1, 6, and 19, giving the balls in a four-layer octahedron. It has six divisors, and in binary it is 101100.
Nearby numbers
How to read this page
The factor list shows every way 44 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 44 for contexts that do not use decimal.
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