687787992 has 48 divisors (see below), whose sum is σ = 1960803000. Its totient is φ = 217195776.

The previous prime is 687787987. The next prime is 687788009. The reversal of 687787992 is 299787786.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250017 + ... + 252752.

Almost surely, 2^687787992 is an apocalyptic number.

It is an amenable number.

687787992 is an abundant number, since it is smaller than the sum of its proper divisors (1273015008).

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

687787992 is a wasteful number, since it uses less digits than its factorization.

687787992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502800 (or 502793 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The square root of 687787992 is about 26225.7124212098. The cubic root of 687787992 is about 882.7103044551.

The spelling of 687787992 in words is "six hundred eighty-seven million, seven hundred eighty-seven thousand, nine hundred ninety-two".