856631568 has 80 divisors (see below), whose sum is σ = 2508658880. Its totient is φ = 249702912.

The previous prime is 856631537. The next prime is 856631597. The reversal of 856631568 is 865136658.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24271 + ... + 47982.

It is an arithmetic number, because the mean of its divisors is an integer number (31358236).

Almost surely, 2^856631568 is an apocalyptic number.

It is an amenable number.

856631568 is an abundant number, since it is smaller than the sum of its proper divisors (1652027312).

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

856631568 is a wasteful number, since it uses less digits than its factorization.

856631568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72296 (or 72290 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The square root of 856631568 is about 29268.2689614538. The cubic root of 856631568 is about 949.7253381419.

The spelling of 856631568 in words is "eight hundred fifty-six million, six hundred thirty-one thousand, five hundred sixty-eight".