44 (number)
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44 is a natural number that comes after 43 and before 45. It is an even number, meaning it is divisible by two with no remainder. In the decimal numbering system, it consists of two identical digits: 4 and 4.
It is used in mathematics, geometry, and common notations such as road numbers, sports numbers, and telephone numbers in some countries.
Mathematical properties
The divisors of 44 are 1, 2, 4, 11, 22, and 44. Its prime factorization is 2² × 11. Consequently, 44 is not a prime number but a composite number. The sum of its proper divisors is 1 + 2 + 4 + 11 + 22 = 40, which is less than 44, making it a deficient number.
44 has other mathematical properties depending on certain classifications: it falls among numbers described as tritriangular or tetradecagonal according to some definitions, though such properties depend on specific definitions. What is certain is that 44 equals 4 × 11 and its square root is approximately 6.63.
Notation and other systems
In Roman numerals, 44 is written as XLIV. In binary (base 2) it is 101100, while in hexadecimal (base 16) it is 2C.
General use
44 is used as the international telephone country code for the United Kingdom (+44). It is also used in year numbering (such as the year 44 AD and 44 BC) and as shirt numbers in team sports.