664640004 has 48 divisors (see below), whose sum is σ = 1776273408. Its totient is φ = 189479328.

The previous prime is 664639999. The next prime is 664640029. The reversal of 664640004 is 400046466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30757 + ... + 47699.

It is an arithmetic number, because the mean of its divisors is an integer number (37005696).

Almost surely, 2^664640004 is an apocalyptic number.

It is an amenable number.

664640004 is an abundant number, since it is smaller than the sum of its proper divisors (1111633404).

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

664640004 is a wasteful number, since it uses less digits than its factorization.

664640004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17424 (or 17422 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 664640004 is about 25780.6129484929. The cubic root of 664640004 is about 872.6943397334.

The spelling of 664640004 in words is "six hundred sixty-four million, six hundred forty thousand, four".