868656 has 20 divisors (see below), whose sum is σ = 2244152. Its totient is φ = 289536.

The previous prime is 868639. The next prime is 868663. The reversal of 868656 is 656868.

868656 = 149² + 150² + ... + 180².

It is a congruent number.

It is an unprimeable number.

868656 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9001 + ... + 9096.

2⁸⁶⁸⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

868656 is an abundant number, since it is smaller than the sum of its proper divisors (1375496).

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

868656 is a wasteful number, since it uses less digits than its factorization.

868656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18108 (or 18102 counting only the distinct ones).

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

The square root of 868656 is about 932.0171672239. The cubic root of 868656 is about 95.4148432705.

The spelling of 868656 in words is "eight hundred sixty-eight thousand, six hundred fifty-six".