685860 has 96 divisors (see below), whose sum is σ = 2322432. Its totient is φ = 147840.

The previous prime is 685859. The next prime is 685907. The reversal of 685860 is 68586.

685860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9625 + ... + 9695.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2⁶⁸⁵⁸⁶⁰ is an apocalyptic number.

685860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161216).

685860 is an abundant number, since it is smaller than the sum of its proper divisors (1636572).

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

685860 is a wasteful number, since it uses less digits than its factorization.

685860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 685860 is about 828.1666498960. The cubic root of 685860 is about 88.1884734604.

The spelling of 685860 in words is "six hundred eighty-five thousand, eight hundred sixty".