687400656 has 20 divisors (see below), whose sum is σ = 1775785152. Its totient is φ = 229133536.

The previous prime is 687400613. The next prime is 687400657. The reversal of 687400656 is 656004786.

It is a happy number.

687400656 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 not an unprimeable number, because it can be changed into a prime (687400657) 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, 7160376 + ... + 7160471.

Almost surely, 2^687400656 is an apocalyptic number.

It is an amenable number.

687400656 is an abundant number, since it is smaller than the sum of its proper divisors (1088384496).

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

687400656 is a wasteful number, since it uses less digits than its factorization.

687400656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14320858 (or 14320852 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 687400656 is about 26218.3267200636. The cubic root of 687400656 is about 882.5445703989.

The spelling of 687400656 in words is "six hundred eighty-seven million, four hundred thousand, six hundred fifty-six".