685724 has 12 divisors (see below), whose sum is σ = 1292424. Its totient is φ = 316464.

The previous prime is 685723. The next prime is 685733. The reversal of 685724 is 427586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6542 + ... + 6645.

It is an arithmetic number, because the mean of its divisors is an integer number (107702).

2⁶⁸⁵⁷²⁴ is an apocalyptic number.

It is an amenable number.

685724 is a deficient number, since it is larger than the sum of its proper divisors (606700).

685724 is a wasteful number, since it uses less digits than its factorization.

685724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13204 (or 13202 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 685724 is about 828.0845367473. The cubic root of 685724 is about 88.1826440758.

The spelling of 685724 in words is "six hundred eighty-five thousand, seven hundred twenty-four".