868320856 has 32 divisors (see below), whose sum is σ = 1759867200. Its totient is φ = 399271680.

The previous prime is 868320853. The next prime is 868320857. The reversal of 868320856 is 658023868.

It is a happy number.

It is a super-2 number, since 2×868320856² = 1507962217929145472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868320853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12780 + ... + 43588.

It is an arithmetic number, because the mean of its divisors is an integer number (54995850).

Almost surely, 2^868320856 is an apocalyptic number.

It is an amenable number.

868320856 is an abundant number, since it is smaller than the sum of its proper divisors (891546344).

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

868320856 is a wasteful number, since it uses less digits than its factorization.

868320856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31099 (or 31095 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 868320856 is about 29467.2845033267. The cubic root of 868320856 is about 954.0257073855.

The spelling of 868320856 in words is "eight hundred sixty-eight million, three hundred twenty thousand, eight hundred fifty-six".