685511256 has 16 divisors (see below), whose sum is σ = 1713778200. Its totient is φ = 228503744.

The previous prime is 685511249. The next prime is 685511257. The reversal of 685511256 is 652115586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685511257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14281461 + ... + 14281508.

Almost surely, 2^685511256 is an apocalyptic number.

It is an amenable number.

685511256 is an abundant number, since it is smaller than the sum of its proper divisors (1028266944).

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

685511256 is a wasteful number, since it uses less digits than its factorization.

685511256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28562978 (or 28562974 counting only the distinct ones).

The product of its digits is 72000, while the sum is 39.

The square root of 685511256 is about 26182.2698786794. The cubic root of 685511256 is about 881.7352365762.

The spelling of 685511256 in words is "six hundred eighty-five million, five hundred eleven thousand, two hundred fifty-six".