664704367 has 4 divisors (see below), whose sum is σ = 665035936. Its totient is φ = 664372800.

The previous prime is 664704329. The next prime is 664704401. The reversal of 664704367 is 763407466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664704367 - 2²⁷ = 530486639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664704167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162759 + ... + 166792.

It is an arithmetic number, because the mean of its divisors is an integer number (166258984).

Almost surely, 2^664704367 is an apocalyptic number.

664704367 is a deficient number, since it is larger than the sum of its proper divisors (331569).

664704367 is a wasteful number, since it uses less digits than its factorization.

664704367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331568.

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 664704367 is about 25781.8612012399. The cubic root of 664704367 is about 872.7225090744.

The spelling of 664704367 in words is "six hundred sixty-four million, seven hundred four thousand, three hundred sixty-seven".