Forty-four is the integer that follows 43 and precedes 45. As an even number it is twice 22, making it the 22nd positive even integer. In common English usage it is written as "forty-four"; in Roman numerals it is XLIV.
Mathematical properties
In arithmetic 44 is a composite number with the prime factorization 2^2 × 11. It has six positive divisors and several standard number-theoretic values that describe its structure and relationships with other integers.
- Prime factorization: 2^2 × 11
- Positive divisors: 1, 2, 4, 11, 22, 44
- Number of divisors (τ): 6; sum of all divisors (σ): 84
- Euler's totient φ(44) = 20 (integers ≤44 coprime to 44)
- Classification: composite, even, not squarefree; proper divisors sum to 40, so it is a deficient number
Representations and bases
Forty-four appears in many positional systems and notations. In binary it is written 101100, in octal 54, in hexadecimal 2C, and in Roman numerals as XLIV. These representations are useful in computing, historical texts and mathematics education.
Uses and cultural notes
The number 44 occurs in several practical and cultural contexts. It is the atomic number of the transition metal ruthenium, appears as the international telephone country code +44 for the United Kingdom, and is associated with firearm calibers such as the ".44" family of cartridges. It also appears in literature, music and sports as an identifiable uniform number or title.
For readers seeking a concise numeric profile, 44 is a small even composite with simple factor structure, elementary divisors, and a handful of recognizable appearances in science and everyday systems. For additional general background on integers and even numbers see related material.