685612 has 6 divisors (see below), whose sum is σ = 1199828. Its totient is φ = 342804.

The previous prime is 685609. The next prime is 685613. The reversal of 685612 is 216586.

685612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (685613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85698 + ... + 85705.

2⁶⁸⁵⁶¹² is an apocalyptic number.

It is an amenable number.

685612 is a deficient number, since it is larger than the sum of its proper divisors (514216).

685612 is a wasteful number, since it uses less digits than its factorization.

685612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171407 (or 171405 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 685612 is about 828.0169080399. The cubic root of 685612 is about 88.1778428273.

Subtracting from 685612 its sum of digits (28), we obtain a square (685584 = 828²).

The spelling of 685612 in words is "six hundred eighty-five thousand, six hundred twelve".