688668239 has 8 divisors (see below), whose sum is σ = 787602720. Its totient is φ = 589872096.

The previous prime is 688668229. The next prime is 688668271. The reversal of 688668239 is 932866886.

688668239 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 cyclic number.

It is not a de Polignac number, because 688668239 - 2¹⁶ = 688602703 is a prime.

It is a super-2 number, since 2×688668239² = 948527886814722242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688668209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23684 + ... + 44025.

It is an arithmetic number, because the mean of its divisors is an integer number (98450340).

Almost surely, 2^688668239 is an apocalyptic number.

688668239 is a deficient number, since it is larger than the sum of its proper divisors (98934481).

688668239 is a wasteful number, since it uses less digits than its factorization.

688668239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69169.

The product of its digits is 5971968, while the sum is 56.

The square root of 688668239 is about 26242.4891921479. The cubic root of 688668239 is about 883.0867149510.

The spelling of 688668239 in words is "six hundred eighty-eight million, six hundred sixty-eight thousand, two hundred thirty-nine".