685742872 has 32 divisors (see below), whose sum is σ = 1363558320. Its totient is φ = 322191360.

The previous prime is 685742857. The next prime is 685742881. The reversal of 685742872 is 278247586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90328 + ... + 97624.

Almost surely, 2^685742872 is an apocalyptic number.

It is an amenable number.

685742872 is a deficient number, since it is larger than the sum of its proper divisors (677815448).

685742872 is a wasteful number, since it uses less digits than its factorization.

685742872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8011 (or 8007 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 49.

The square root of 685742872 is about 26186.6926510394. The cubic root of 685742872 is about 881.8345303468.

It can be divided in two parts, 6857 and 42872, that added together give a square (49729 = 223²).

The spelling of 685742872 in words is "six hundred eighty-five million, seven hundred forty-two thousand, eight hundred seventy-two".