664904 has 16 divisors (see below), whose sum is σ = 1320300.
Its totient is φ = 312832.
The previous prime is 664891. The next prime is 664933. The reversal of 664904 is 409466.
It can be written as a sum of positive squares in 2 ways, for example, as 624100 + 40804 = 790^2 + 202^2
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2309 + ... + 2580.
2664904 is an apocalyptic number.
It is an amenable number.
664904 is a deficient number, since it is larger than the sum of its proper divisors (655396).
664904 is a wasteful number, since it uses less digits than its factorization.
664904 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4912 (or 4908 counting only the distinct ones).
The product of its (nonzero) digits is 5184, while the sum is 29.
The square root of 664904 is about 815.4164580139.
The cubic root of 664904 is about 87.2809869603.
The spelling of 664904 in words is "six hundred sixty-four thousand, nine hundred four".