656980 has 24 divisors (see below), whose sum is σ = 1397088. Its totient is φ = 259488.

The previous prime is 656977. The next prime is 656989. The reversal of 656980 is 89656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656989) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1987 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (58212).

2⁶⁵⁶⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

656980 is an abundant number, since it is smaller than the sum of its proper divisors (740108).

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

656980 is a wasteful number, since it uses less digits than its factorization.

656980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 656980 is about 810.5430278523. The cubic root of 656980 is about 86.9328763970.

The spelling of 656980 in words is "six hundred fifty-six thousand, nine hundred eighty".