687881978222976 has 192 divisors, whose sum is σ = 1980267718122720. Its totient is φ = 229199529885696.

The previous prime is 687881978222911. The next prime is 687881978223047. The reversal of 687881978222976 is 679222879188786.

687881978222976 is a `hidden beast` number, since 6 + 87 + 8 + 81 + 97 + 82 + 2 + 297 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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, 44717016181 + ... + 44717031563.

Almost surely, 2^{687881978222976} is an apocalyptic number.

It is an amenable number.

687881978222976 is an abundant number, since it is smaller than the sum of its proper divisors (1292385739899744).

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

687881978222976 is a wasteful number, since it uses less digits than its factorization.

687881978222976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28873 (or 28858 counting only the distinct ones).

The product of its digits is 32774160384, while the sum is 90.

The spelling of 687881978222976 in words is "six hundred eighty-seven trillion, eight hundred eighty-one billion, nine hundred seventy-eight million, two hundred twenty-two thousand, nine hundred seventy-six".