687013138 has 32 divisors (see below), whose sum is σ = 1209696768. Its totient is φ = 286483200.

The previous prime is 687013123. The next prime is 687013177. The reversal of 687013138 is 831310786.

It is a junction number, because it is equal to n+sod(n) for n = 687013097 and 687013106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246006 + ... + 248782.

It is an arithmetic number, because the mean of its divisors is an integer number (37803024).

Almost surely, 2^687013138 is an apocalyptic number.

687013138 is a deficient number, since it is larger than the sum of its proper divisors (522683630).

687013138 is a wasteful number, since it uses less digits than its factorization.

687013138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 687013138 is about 26210.9354659463. The cubic root of 687013138 is about 882.3786961540.

The spelling of 687013138 in words is "six hundred eighty-seven million, thirteen thousand, one hundred thirty-eight".