687371836 has 24 divisors (see below), whose sum is σ = 1256137344. Its totient is φ = 328497840.

The previous prime is 687371807. The next prime is 687371849. The reversal of 687371836 is 638173786.

It is a self number, because there is not a number n which added to its sum of digits gives 687371836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204691 + ... + 208021.

It is an arithmetic number, because the mean of its divisors is an integer number (52339056).

Almost surely, 2^687371836 is an apocalyptic number.

It is an amenable number.

687371836 is a deficient number, since it is larger than the sum of its proper divisors (568765508).

687371836 is a wasteful number, since it uses less digits than its factorization.

687371836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601 (or 5599 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 49.

The square root of 687371836 is about 26217.7770987550. Note that the first 3 decimals coincide. The cubic root of 687371836 is about 882.5322363548.

The spelling of 687371836 in words is "six hundred eighty-seven million, three hundred seventy-one thousand, eight hundred thirty-six".