664332864 has 56 divisors (see below), whose sum is σ = 1892929920. Its totient is φ = 204409344.

The previous prime is 664332863. The next prime is 664332869. The reversal of 664332864 is 468233466.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (664332863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130584 + ... + 135575.

It is an arithmetic number, because the mean of its divisors is an integer number (33802320).

Almost surely, 2^664332864 is an apocalyptic number.

664332864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664332864 is an abundant number, since it is smaller than the sum of its proper divisors (1228597056).

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

664332864 is a wasteful number, since it uses less digits than its factorization.

664332864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266187 (or 266177 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The square root of 664332864 is about 25774.6554584150. The cubic root of 664332864 is about 872.5598906899.

The spelling of 664332864 in words is "six hundred sixty-four million, three hundred thirty-two thousand, eight hundred sixty-four".