688638616 has 16 divisors (see below), whose sum is σ = 1295764200. Its totient is φ = 343101504.

The previous prime is 688638569. The next prime is 688638623. The reversal of 688638616 is 616836886.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149821 + ... + 154348.

Almost surely, 2^688638616 is an apocalyptic number.

It is an amenable number.

688638616 is a deficient number, since it is larger than the sum of its proper divisors (607125584).

688638616 is a wasteful number, since it uses less digits than its factorization.

688638616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304458 (or 304454 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 52.

The square root of 688638616 is about 26241.9247769671. The cubic root of 688638616 is about 883.0740528052.

The spelling of 688638616 in words is "six hundred eighty-eight million, six hundred thirty-eight thousand, six hundred sixteen".