685506 has 16 divisors (see below), whose sum is σ = 1403424. Its totient is φ = 223104.

The previous prime is 685493. The next prime is 685511. The reversal of 685506 is 605586.

685506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071 + ... + 1586.

It is an arithmetic number, because the mean of its divisors is an integer number (87714).

2⁶⁸⁵⁵⁰⁶ is an apocalyptic number.

685506 is an abundant number, since it is smaller than the sum of its proper divisors (717918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685506 is a wasteful number, since it uses less digits than its factorization.

685506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 685506 is about 827.9528972109. The cubic root of 685506 is about 88.1732983070.

The spelling of 685506 in words is "six hundred eighty-five thousand, five hundred six".