687987976 has 16 divisors (see below), whose sum is σ = 1389206700. Its totient is φ = 317532864.

The previous prime is 687987907. The next prime is 687987997. The reversal of 687987976 is 679789786.

It can be written as a sum of positive squares in 2 ways, for example, as 687803076 + 184900 = 26226^2 + 430^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3307531 + ... + 3307738.

Almost surely, 2^687987976 is an apocalyptic number.

It is an amenable number.

687987976 is an abundant number, since it is smaller than the sum of its proper divisors (701218724).

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

687987976 is a wasteful number, since it uses less digits than its factorization.

687987976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615288 (or 6615284 counting only the distinct ones).

The product of its digits is 64012032, while the sum is 67.

The square root of 687987976 is about 26229.5248908553. The cubic root of 687987976 is about 882.7958496294.

The spelling of 687987976 in words is "six hundred eighty-seven million, nine hundred eighty-seven thousand, nine hundred seventy-six".