685656 has 48 divisors (see below), whose sum is σ = 1895400. Its totient is φ = 223872.

The previous prime is 685649. The next prime is 685669. The reversal of 685656 is 656586.

685656 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-3 number, since 3×685656³ = 967030333268341248, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 685656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6355 + ... + 6461.

2⁶⁸⁵⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947700).

685656 is an abundant number, since it is smaller than the sum of its proper divisors (1209744).

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

685656 is a wasteful number, since it uses less digits than its factorization.

685656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 201 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 685656 is about 828.0434771194. The cubic root of 685656 is about 88.1797290944.

The spelling of 685656 in words is "six hundred eighty-five thousand, six hundred fifty-six".