685708 has 6 divisors (see below), whose sum is σ = 1199996. Its totient is φ = 342852.

The previous prime is 685697. The next prime is 685717. The reversal of 685708 is 807586.

685708 is nontrivially palindromic in base 15.

685708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×685708² = 940390922528, which contains 22 as substring.

It is an unprimeable number.

685708 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85710 + ... + 85717.

2⁶⁸⁵⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

685708 is a deficient number, since it is larger than the sum of its proper divisors (514288).

685708 is a wasteful number, since it uses less digits than its factorization.

685708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171431 (or 171429 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 685708 is about 828.0748758416. The cubic root of 685708 is about 88.1819582152.

It can be divided in two parts, 68 and 5708, that added together give a square (5776 = 76²).

The spelling of 685708 in words is "six hundred eighty-five thousand, seven hundred eight".