656004 has 12 divisors (see below), whose sum is σ = 1530704. Its totient is φ = 218664.

The previous prime is 655987. The next prime is 656023. The reversal of 656004 is 400656.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

656004 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27322 + ... + 27345.

2⁶⁵⁶⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

656004 is an abundant number, since it is smaller than the sum of its proper divisors (874700).

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

656004 is a wasteful number, since it uses less digits than its factorization.

656004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54674 (or 54672 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 656004 is about 809.9407385729. The cubic root of 656004 is about 86.8898063200.

The spelling of 656004 in words is "six hundred fifty-six thousand, four".