664504 has 8 divisors (see below), whose sum is σ = 1245960. Its totient is φ = 332248.

The previous prime is 664471. The next prime is 664507. The reversal of 664504 is 405466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664507) by changing a digit.

664504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41524 + ... + 41539.

It is an arithmetic number, because the mean of its divisors is an integer number (155745).

2⁶⁶⁴⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

664504 is a deficient number, since it is larger than the sum of its proper divisors (581456).

664504 is a wasteful number, since it uses less digits than its factorization.

664504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83069 (or 83065 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 664504 is about 815.1711476739. The cubic root of 664504 is about 87.2634809754.

The spelling of 664504 in words is "six hundred sixty-four thousand, five hundred four".