64439625 has 32 divisors (see below), whose sum is σ = 107842176. Its totient is φ = 34171200.

The previous prime is 64439597. The next prime is 64439651. The reversal of 64439625 is 52693446.

It is not a de Polignac number, because 64439625 - 2⁵ = 64439593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84747 + ... + 85503.

It is an arithmetic number, because the mean of its divisors is an integer number (3370068).

Almost surely, 2^64439625 is an apocalyptic number.

It is an amenable number.

64439625 is a deficient number, since it is larger than the sum of its proper divisors (43402551).

64439625 is a wasteful number, since it uses less digits than its factorization.

64439625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 992 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 64439625 is about 8027.4295387752. The cubic root of 64439625 is about 400.9137962679.

The spelling of 64439625 in words is "sixty-four million, four hundred thirty-nine thousand, six hundred twenty-five".