688865256 has 32 divisors (see below), whose sum is σ = 1913515200. Its totient is φ = 229621680.

The previous prime is 688865237. The next prime is 688865263. The reversal of 688865256 is 652568886.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1594380 + ... + 1594811.

It is an arithmetic number, because the mean of its divisors is an integer number (59797350).

Almost surely, 2^688865256 is an apocalyptic number.

It is an amenable number.

688865256 is an abundant number, since it is smaller than the sum of its proper divisors (1224649944).

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

688865256 is a wasteful number, since it uses less digits than its factorization.

688865256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189206 (or 3189196 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The square root of 688865256 is about 26246.2427025279. The cubic root of 688865256 is about 883.1709192634.

The spelling of 688865256 in words is "six hundred eighty-eight million, eight hundred sixty-five thousand, two hundred fifty-six".