44 has 6 divisors (see below), whose sum is σ = 84. Its totient is φ = 20.

The previous prime is 43. The next prime is 47.

Subtracting from 44 its product of digits (16), we obtain a triangular number (28 = T_{7}).

It is a happy number.

44 is nontrivially palindromic in base 10.

44 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

44 is an esthetic number in base 8 and base 14, because in such bases its adjacent digits differ by 1.

It is a nude number because it is divisible by every one of its digits.

It is a tribonacci number.

It is a O'Halloran number.

44 is a nontrivial repdigit in base 10.

It is a plaindrome in base 3, base 5, base 6, base 9, base 10, base 12, base 13, base 15 and base 16.

It is a nialpdrome in base 7, base 8, base 10, base 11 and base 14.

It is a zygodrome in base 3 and base 10.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a subfactorial, being equal to the number of derangements of 5 objects .

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2 + ... + 9.

It is an arithmetic number, because the mean of its divisors is an integer number (14).

It is an amenable number.

44 is a deficient number, since it is larger than the sum of its proper divisors (40).

44 is a wasteful number, since it uses less digits than its factorization.

44 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15 (or 13 counting only the distinct ones).

The product of its digits is 16, while the sum is 8.

The square root of 44 is about 6.6332495807. The cubic root of 44 is about 3.5303483353.

The spelling of 44 in words is "forty-four", and thus it is an aban number, an eban number, and an iban number.

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