688679774 has 8 divisors (see below), whose sum is σ = 1052510760. Its totient is φ = 337842856.

The previous prime is 688679699. The next prime is 688679867. The reversal of 688679774 is 477976886.

688679774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×688679774² = 948559662233382152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3248384 + ... + 3248595.

It is an arithmetic number, because the mean of its divisors is an integer number (131563845).

Almost surely, 2^688679774 is an apocalyptic number.

688679774 is a deficient number, since it is larger than the sum of its proper divisors (363830986).

688679774 is a wasteful number, since it uses less digits than its factorization.

688679774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497034.

The product of its digits is 28449792, while the sum is 62.

The square root of 688679774 is about 26242.7089683973. The cubic root of 688679774 is about 883.0916454084.

The spelling of 688679774 in words is "six hundred eighty-eight million, six hundred seventy-nine thousand, seven hundred seventy-four".