687662975 has 12 divisors (see below), whose sum is σ = 857036664. Its totient is φ = 547333920.

The previous prime is 687662951. The next prime is 687662977. The reversal of 687662975 is 579266786.

It is not a de Polignac number, because 687662975 - 2²² = 683468671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687662975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687662977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64889 + ... + 74738.

It is an arithmetic number, because the mean of its divisors is an integer number (71419722).

Almost surely, 2^687662975 is an apocalyptic number.

687662975 is a deficient number, since it is larger than the sum of its proper divisors (169373689).

687662975 is a wasteful number, since it uses less digits than its factorization.

687662975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139834 (or 139829 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 56.

The square root of 687662975 is about 26223.3288314051. The cubic root of 687662975 is about 882.6568187481.

The spelling of 687662975 in words is "six hundred eighty-seven million, six hundred sixty-two thousand, nine hundred seventy-five".