685700 has 18 divisors (see below), whose sum is σ = 1488186. Its totient is φ = 274240.

The previous prime is 685697. The next prime is 685717. The reversal of 685700 is 7586.

It can be written as a sum of positive squares in 3 ways, for example, as 6724 + 678976 = 82^2 + 824^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 685700.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3329 + ... + 3528.

It is an arithmetic number, because the mean of its divisors is an integer number (82677).

2⁶⁸⁵⁷⁰⁰ is an apocalyptic number.

It is an amenable number.

685700 is an abundant number, since it is smaller than the sum of its proper divisors (802486).

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

685700 is a wasteful number, since it uses less digits than its factorization.

685700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871 (or 6864 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 685700 is about 828.0700453464. The cubic root of 685700 is about 88.1816152808.

The spelling of 685700 in words is "six hundred eighty-five thousand, seven hundred".