687168736 has 24 divisors (see below), whose sum is σ = 1389429720. Its totient is φ = 334297728.

The previous prime is 687168731. The next prime is 687168749. The reversal of 687168736 is 637861786.

687168736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687168731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289006 + ... + 291373.

It is an arithmetic number, because the mean of its divisors is an integer number (57892905).

Almost surely, 2^687168736 is an apocalyptic number.

It is an amenable number.

687168736 is an abundant number, since it is smaller than the sum of its proper divisors (702260984).

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

687168736 is a wasteful number, since it uses less digits than its factorization.

687168736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580426 (or 580418 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The square root of 687168736 is about 26213.9034865088. The cubic root of 687168736 is about 882.4453062322.

The spelling of 687168736 in words is "six hundred eighty-seven million, one hundred sixty-eight thousand, seven hundred thirty-six".