44640981 has 48 divisors (see below), whose sum is σ = 82612608. Its totient is φ = 22550400.

The previous prime is 44640949. The next prime is 44640983. The reversal of 44640981 is 18904644.

It is a happy number.

44640981 is a `hidden beast` number, since 4 + 4 + 640 + 9 + 8 + 1 = 666.

44640981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 44640981 - 2⁵ = 44640949 is a prime.

It is a super-2 number, since 2×44640981² = 3985634369284722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44640983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24771 + ... + 26511.

It is an arithmetic number, because the mean of its divisors is an integer number (1721096).

Almost surely, 2^44640981 is an apocalyptic number.

It is an amenable number.

44640981 is a deficient number, since it is larger than the sum of its proper divisors (37971627).

44640981 is a wasteful number, since it uses less digits than its factorization.

44640981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 44640981 is about 6681.3906486599. The cubic root of 44640981 is about 354.7408834539.

The spelling of 44640981 in words is "forty-four million, six hundred forty thousand, nine hundred eighty-one".