685631536 has 20 divisors (see below), whose sum is σ = 1328821200. Its totient is φ = 342709952.

The previous prime is 685631501. The next prime is 685631567. The reversal of 685631536 is 635136586.

It is a junction number, because it is equal to n+sod(n) for n = 685631492 and 685631501.

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, 86925 + ... + 94483.

It is an arithmetic number, because the mean of its divisors is an integer number (66441060).

Almost surely, 2^685631536 is an apocalyptic number.

685631536 is the 15118-th octagonal number.

It is an amenable number.

685631536 is a deficient number, since it is larger than the sum of its proper divisors (643189664).

685631536 is a wasteful number, since it uses less digits than its factorization.

685631536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13236 (or 13230 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 685631536 is about 26184.5667521920. The cubic root of 685631536 is about 881.7868033988.

The spelling of 685631536 in words is "six hundred eighty-five million, six hundred thirty-one thousand, five hundred thirty-six".