685589 has 8 divisors (see below), whose sum is σ = 725760. Its totient is φ = 646576.

The previous prime is 685547. The next prime is 685591. The reversal of 685589 is 985586.

685589 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 685589 - 2¹² = 681493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685519) 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, 1112 + ... + 1614.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2⁶⁸⁵⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

685589 is a deficient number, since it is larger than the sum of its proper divisors (40171).

685589 is a wasteful number, since it uses less digits than its factorization.

685589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579.

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

The square root of 685589 is about 828.0030193182. The cubic root of 685589 is about 88.1768567919.

The spelling of 685589 in words is "six hundred eighty-five thousand, five hundred eighty-nine".