688643256 has 48 divisors (see below), whose sum is σ = 2002690440. Its totient is φ = 196754880.

The previous prime is 688643243. The next prime is 688643303. The reversal of 688643256 is 652346886.

688643256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291615 + ... + 293966.

Almost surely, 2^688643256 is an apocalyptic number.

It is an amenable number.

688643256 is an abundant number, since it is smaller than the sum of its proper divisors (1314047184).

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

688643256 is a wasteful number, since it uses less digits than its factorization.

688643256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585604 (or 585593 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 48.

The square root of 688643256 is about 26242.0131849673. The cubic root of 688643256 is about 883.0760361650.

The spelling of 688643256 in words is "six hundred eighty-eight million, six hundred forty-three thousand, two hundred fifty-six".