687938614956 has 72 divisors (see below), whose sum is σ = 1830596040000. Its totient is φ = 217229994720.

The previous prime is 687938614931. The next prime is 687938614973. The reversal of 687938614956 is 659416839786.

687938614956 is a `hidden beast` number, since 6 + 8 + 79 + 3 + 8 + 61 + 495 + 6 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19475671 + ... + 19510961.

It is an arithmetic number, because the mean of its divisors is an integer number (25424945000).

Almost surely, 2^687938614956 is an apocalyptic number.

It is an amenable number.

687938614956 is an abundant number, since it is smaller than the sum of its proper divisors (1142657425044).

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

687938614956 is a wasteful number, since it uses less digits than its factorization.

687938614956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63819 (or 63814 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 72.

The spelling of 687938614956 in words is "six hundred eighty-seven billion, nine hundred thirty-eight million, six hundred fourteen thousand, nine hundred fifty-six".