656868 has 48 divisors (see below), whose sum is σ = 1675520. Its totient is φ = 199584.

The previous prime is 656839. The next prime is 656891. The reversal of 656868 is 868656.

It is an unprimeable number.

656868 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 15 ways as a sum of consecutive naturals, for example, 9771 + ... + 9837.

2⁶⁵⁶⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837760).

656868 is an abundant number, since it is smaller than the sum of its proper divisors (1018652).

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

656868 is a wasteful number, since it uses less digits than its factorization.

656868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 134 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 656868 is about 810.4739354230. The cubic root of 656868 is about 86.9279360967.

The spelling of 656868 in words is "six hundred fifty-six thousand, eight hundred sixty-eight".