687931973694 has 48 divisors (see below), whose sum is σ = 1703573334528. Its totient is φ = 196537831056.

The previous prime is 687931973669. The next prime is 687931973711. The reversal of 687931973694 is 496379139786.

687931973694 is a `hidden beast` number, since 6 + 8 + 79 + 3 + 197 + 369 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1625799 + ... + 2004765.

It is an arithmetic number, because the mean of its divisors is an integer number (35491111136).

Almost surely, 2^687931973694 is an apocalyptic number.

687931973694 is an abundant number, since it is smaller than the sum of its proper divisors (1015641360834).

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

687931973694 is a wasteful number, since it uses less digits than its factorization.

687931973694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393389 (or 393386 counting only the distinct ones).

The product of its digits is 370355328, while the sum is 72.

The spelling of 687931973694 in words is "six hundred eighty-seven billion, nine hundred thirty-one million, nine hundred seventy-three thousand, six hundred ninety-four".