664494304 has 12 divisors (see below), whose sum is σ = 1308223224. Its totient is φ = 332247136.

The previous prime is 664494301. The next prime is 664494307. The reversal of 664494304 is 403494466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664494301) and next prime (664494307).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664494301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382692 + ... + 10382755.

It is an arithmetic number, because the mean of its divisors is an integer number (109018602).

Almost surely, 2^664494304 is an apocalyptic number.

It is an amenable number.

664494304 is a deficient number, since it is larger than the sum of its proper divisors (643728920).

664494304 is a wasteful number, since it uses less digits than its factorization.

664494304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20765457 (or 20765449 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 664494304 is about 25777.7870268183. The cubic root of 664494304 is about 872.6305654311.

The spelling of 664494304 in words is "six hundred sixty-four million, four hundred ninety-four thousand, three hundred four".