687545556 has 12 divisors (see below), whose sum is σ = 1604272992. Its totient is φ = 229181848.

The previous prime is 687545531. The next prime is 687545561. The reversal of 687545556 is 655545786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 687545499 and 687545508.

It is a congruent number.

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, 28647720 + ... + 28647743.

It is an arithmetic number, because the mean of its divisors is an integer number (133689416).

Almost surely, 2^687545556 is an apocalyptic number.

It is an amenable number.

687545556 is an abundant number, since it is smaller than the sum of its proper divisors (916727436).

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

687545556 is a wasteful number, since it uses less digits than its factorization.

687545556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57295470 (or 57295468 counting only the distinct ones).

The product of its digits is 5040000, while the sum is 51.

The square root of 687545556 is about 26221.0899086975. The cubic root of 687545556 is about 882.6065777705.

The spelling of 687545556 in words is "six hundred eighty-seven million, five hundred forty-five thousand, five hundred fifty-six".