664400704 has 28 divisors (see below), whose sum is σ = 1438278048. Its totient is φ = 302000000.

The previous prime is 664400699. The next prime is 664400717. The reversal of 664400704 is 407004466.

664400704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471172 + ... + 472579.

Almost surely, 2^664400704 is an apocalyptic number.

664400704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664400704 is an abundant number, since it is smaller than the sum of its proper divisors (773877344).

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

664400704 is a wasteful number, since it uses less digits than its factorization.

664400704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943774 (or 943764 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 664400704 is about 25775.9714462908. The cubic root of 664400704 is about 872.5895908856.

The spelling of 664400704 in words is "six hundred sixty-four million, four hundred thousand, seven hundred four".