685884 has 24 divisors (see below), whose sum is σ = 1628368. Its totient is φ = 224640.

The previous prime is 685859. The next prime is 685907. The reversal of 685884 is 488586.

It is a super-2 number, since 2×685884² = 940873722912, which contains 22 as substring.

It is a nialpdrome in base 7.

It is a congruent number.

It is an unprimeable number.

685884 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 in 7 ways as a sum of consecutive naturals, for example, 264 + ... + 1200.

2⁶⁸⁵⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

685884 is an abundant number, since it is smaller than the sum of its proper divisors (942484).

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

685884 is a wasteful number, since it uses less digits than its factorization.

685884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 1003 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 685884 is about 828.1811396065. The cubic root of 685884 is about 88.1895020953.

The spelling of 685884 in words is "six hundred eighty-five thousand, eight hundred eighty-four".