64904440 has 32 divisors (see below), whose sum is σ = 146328480. Its totient is φ = 25909632.

The previous prime is 64904417. The next prime is 64904449. The reversal of 64904440 is 4440946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64904449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23197 + ... + 25843.

It is an arithmetic number, because the mean of its divisors is an integer number (4572765).

Almost surely, 2^64904440 is an apocalyptic number.

It is an amenable number.

64904440 is an abundant number, since it is smaller than the sum of its proper divisors (81424040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64904440 is a wasteful number, since it uses less digits than its factorization.

64904440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 64904440 is about 8056.3291889048. The cubic root of 64904440 is about 401.8754430409.

The spelling of 64904440 in words is "sixty-four million, nine hundred four thousand, four hundred forty".