687087856892 has 12 divisors (see below), whose sum is σ = 1231730670576. Its totient is φ = 335164808160.

The previous prime is 687087856883. The next prime is 687087856921. The reversal of 687087856892 is 298658780786.

It is a happy number.

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, 2094779888 + ... + 2094780215.

It is an arithmetic number, because the mean of its divisors is an integer number (102644222548).

Almost surely, 2^687087856892 is an apocalyptic number.

It is an amenable number.

687087856892 is a deficient number, since it is larger than the sum of its proper divisors (544642813684).

687087856892 is a wasteful number, since it uses less digits than its factorization.

687087856892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189560148 (or 4189560146 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 74.

The spelling of 687087856892 in words is "six hundred eighty-seven billion, eighty-seven million, eight hundred fifty-six thousand, eight hundred ninety-two".