688559 has 8 divisors (see below), whose sum is σ = 718080. Its totient is φ = 659736.

The previous prime is 688543. The next prime is 688561. The reversal of 688559 is 955886.

688559 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 688559 - 2⁴ = 688543 is a prime.

It is a super-2 number, since 2×688559² = 948226992962, 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 (688159) 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, 2762 + ... + 3000.

It is an arithmetic number, because the mean of its divisors is an integer number (89760).

2⁶⁸⁸⁵⁵⁹ is an apocalyptic number.

688559 is a deficient number, since it is larger than the sum of its proper divisors (29521).

688559 is a wasteful number, since it uses less digits than its factorization.

688559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349.

The product of its digits is 86400, while the sum is 41.

The square root of 688559 is about 829.7945528864. The cubic root of 688559 is about 88.3040019699.

The spelling of 688559 in words is "six hundred eighty-eight thousand, five hundred fifty-nine".