864572856 has 48 divisors (see below), whose sum is σ = 2514322440. Its totient is φ = 247020480.

The previous prime is 864572851. The next prime is 864572867. The reversal of 864572856 is 658275468.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 864572799 and 864572808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864572851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 366415 + ... + 368766.

Almost surely, 2^864572856 is an apocalyptic number.

It is an amenable number.

864572856 is an abundant number, since it is smaller than the sum of its proper divisors (1649749584).

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

864572856 is a wasteful number, since it uses less digits than its factorization.

864572856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735204 (or 735193 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 51.

The square root of 864572856 is about 29403.6197771635. The cubic root of 864572856 is about 952.6510828744.

The spelling of 864572856 in words is "eight hundred sixty-four million, five hundred seventy-two thousand, eight hundred fifty-six".