685787968 has 28 divisors (see below), whose sum is σ = 1366730820. Its totient is φ = 341414912.

The previous prime is 685787917. The next prime is 685787981. The reversal of 685787968 is 869787586.

It can be written as a sum of positive squares in 2 ways, for example, as 51151104 + 634636864 = 7152^2 + 25192^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8083 + ... + 37906.

It is an arithmetic number, because the mean of its divisors is an integer number (48811815).

Almost surely, 2^685787968 is an apocalyptic number.

It is an amenable number.

685787968 is a deficient number, since it is larger than the sum of its proper divisors (680942852).

685787968 is a wasteful number, since it uses less digits than its factorization.

685787968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46234 (or 46224 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 64.

The square root of 685787968 is about 26187.5536849092. The cubic root of 685787968 is about 881.8538603998.

The spelling of 685787968 in words is "six hundred eighty-five million, seven hundred eighty-seven thousand, nine hundred sixty-eight".