686905983988 has 48 divisors (see below), whose sum is σ = 1423361916928. Its totient is φ = 283840524000.

The previous prime is 686905983979. The next prime is 686905984003. The reversal of 686905983988 is 889389509686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1224858 + ... + 1695313.

Almost surely, 2^686905983988 is an apocalyptic number.

It is an amenable number.

686905983988 is an abundant number, since it is smaller than the sum of its proper divisors (736455932940).

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

686905983988 is a wasteful number, since it uses less digits than its factorization.

686905983988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920484 (or 2920482 counting only the distinct ones).

The product of its (nonzero) digits is 1612431360, while the sum is 79.

The spelling of 686905983988 in words is "six hundred eighty-six billion, nine hundred five million, nine hundred eighty-three thousand, nine hundred eighty-eight".