687937138 has 32 divisors (see below), whose sum is σ = 1221350400. Its totient is φ = 284506560.

The previous prime is 687937127. The next prime is 687937163. The reversal of 687937138 is 831739786.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 37663 + ... + 52861.

It is an arithmetic number, because the mean of its divisors is an integer number (38167200).

Almost surely, 2^687937138 is an apocalyptic number.

687937138 is a deficient number, since it is larger than the sum of its proper divisors (533413262).

687937138 is a wasteful number, since it uses less digits than its factorization.

687937138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15322.

The product of its digits is 1524096, while the sum is 52.

The square root of 687937138 is about 26228.5557741939. Note that the first 3 decimals coincide. The cubic root of 687937138 is about 882.7741047335.

The spelling of 687937138 in words is "six hundred eighty-seven million, nine hundred thirty-seven thousand, one hundred thirty-eight".