656628 has 24 divisors (see below), whose sum is σ = 1751232. Its totient is φ = 187584.

The previous prime is 656609. The next prime is 656651. The reversal of 656628 is 826656.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

656628 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 in 7 ways as a sum of consecutive naturals, for example, 3825 + ... + 3992.

It is an arithmetic number, because the mean of its divisors is an integer number (72968).

2⁶⁵⁶⁶²⁸ is an apocalyptic number.

It is an amenable number.

656628 is an abundant number, since it is smaller than the sum of its proper divisors (1094604).

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

656628 is a wasteful number, since it uses less digits than its factorization.

656628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7831 (or 7829 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 656628 is about 810.3258603796. The cubic root of 656628 is about 86.9173478476.

The spelling of 656628 in words is "six hundred fifty-six thousand, six hundred twenty-eight".