656920 has 32 divisors (see below), whose sum is σ = 1613520. Its totient is φ = 238720.

The previous prime is 656917. The next prime is 656923. The reversal of 656920 is 29656.

It is an interprime number because it is at equal distance from previous prime (656917) and next prime (656923).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307 + ... + 1186.

2⁶⁵⁶⁹²⁰ is an apocalyptic number.

It is an amenable number.

656920 is an abundant number, since it is smaller than the sum of its proper divisors (956600).

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

656920 is a wasteful number, since it uses less digits than its factorization.

656920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1511 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 656920 is about 810.5060147834. The cubic root of 656920 is about 86.9302298774.

Subtracting from 656920 its reverse (29656), we obtain a square (627264 = 792²).

The spelling of 656920 in words is "six hundred fifty-six thousand, nine hundred twenty".