688865 has 8 divisors (see below), whose sum is σ = 831168. Its totient is φ = 548080.

The previous prime is 688861. The next prime is 688867. The reversal of 688865 is 568886.

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

It is not a de Polignac number, because 688865 - 2² = 688861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688861) 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, 1334 + ... + 1776.

It is an arithmetic number, because the mean of its divisors is an integer number (103896).

2⁶⁸⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

688865 is a deficient number, since it is larger than the sum of its proper divisors (142303).

688865 is a wasteful number, since it uses less digits than its factorization.

688865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759.

The product of its digits is 92160, while the sum is 41.

The square root of 688865 is about 829.9789153948. The cubic root of 688865 is about 88.3170809860.

The spelling of 688865 in words is "six hundred eighty-eight thousand, eight hundred sixty-five".