390625164 has 36 divisors (see below), whose sum is σ = 989218776. Its totient is φ = 129970368.

The previous prime is 390625159. The next prime is 390625171. The reversal of 390625164 is 461526093.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10632 + ... + 29904.

Almost surely, 2^390625164 is an apocalyptic number.

It is an amenable number.

390625164 is an abundant number, since it is smaller than the sum of its proper divisors (598593612).

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

390625164 is a wasteful number, since it uses less digits than its factorization.

390625164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19846 (or 19841 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 390625164 is about 19764.2395249602. The cubic root of 390625164 is about 731.0045368548.

The spelling of 390625164 in words is "three hundred ninety million, six hundred twenty-five thousand, one hundred sixty-four".