685089 has 12 divisors (see below), whose sum is σ = 997776. Its totient is φ = 452952.

The previous prime is 685081. The next prime is 685093. The reversal of 685089 is 980586.

It is not a de Polignac number, because 685089 - 2³ = 685081 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (685081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1234 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (83148).

2⁶⁸⁵⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

685089 is a deficient number, since it is larger than the sum of its proper divisors (312687).

685089 is a wasteful number, since it uses less digits than its factorization.

685089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 685089 is about 827.7010329823. The cubic root of 685089 is about 88.1554157874.

The spelling of 685089 in words is "six hundred eighty-five thousand, eighty-nine".