688579 has 4 divisors (see below), whose sum is σ = 724840. Its totient is φ = 652320.

The previous prime is 688573. The next prime is 688591. The reversal of 688579 is 975886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 975886 = 2 ⋅487943.

It is a cyclic number.

It is not a de Polignac number, because 688579 - 2⁷ = 688451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18102 + ... + 18139.

It is an arithmetic number, because the mean of its divisors is an integer number (181210).

2⁶⁸⁸⁵⁷⁹ is an apocalyptic number.

688579 is a deficient number, since it is larger than the sum of its proper divisors (36261).

688579 is a wasteful number, since it uses less digits than its factorization.

688579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36260.

The product of its digits is 120960, while the sum is 43.

The square root of 688579 is about 829.8066039747. The cubic root of 688579 is about 88.3048569259.

The spelling of 688579 in words is "six hundred eighty-eight thousand, five hundred seventy-nine".