864656 has 20 divisors (see below), whose sum is σ = 1804572. Its totient is φ = 398976.

The previous prime is 864641. The next prime is 864673. The reversal of 864656 is 656468.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 614656 = 500^2 + 784^2 .

It is an unprimeable number.

864656 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 3 ways as a sum of consecutive naturals, for example, 1871 + ... + 2286.

2⁸⁶⁴⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

864656 is an abundant number, since it is smaller than the sum of its proper divisors (939916).

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

864656 is a wasteful number, since it uses less digits than its factorization.

864656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178 (or 4172 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 864656 is about 929.8688079509. The cubic root of 864656 is about 95.2681619990.

The spelling of 864656 in words is "eight hundred sixty-four thousand, six hundred fifty-six".