688089 has 8 divisors (see below), whose sum is σ = 942400. Its totient is φ = 446256.

The previous prime is 688087. The next prime is 688097. The reversal of 688089 is 980886.

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

It is not a de Polignac number, because 688089 - 2¹ = 688087 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 688089.

It is not an unprimeable number, because it can be changed into a prime (688087) 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, 2989 + ... + 3210.

It is an arithmetic number, because the mean of its divisors is an integer number (117800).

2⁶⁸⁸⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

688089 is a deficient number, since it is larger than the sum of its proper divisors (254311).

688089 is a wasteful number, since it uses less digits than its factorization.

688089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 688089 is about 829.5113019122. The cubic root of 688089 is about 88.2839057363.

The spelling of 688089 in words is "six hundred eighty-eight thousand, eighty-nine".