685560 has 64 divisors (see below), whose sum is σ = 2138400. Its totient is φ = 175616.

The previous prime is 685547. The next prime is 685591. The reversal of 685560 is 65586.

It is a Harshad number since it is a multiple of its sum of digits (30).

685560 is a Rhonda number in base 9.

It is a congruent number.

It is an unprimeable number.

685560 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 15 ways as a sum of consecutive naturals, for example, 3382 + ... + 3578.

2⁶⁸⁵⁵⁶⁰ is an apocalyptic number.

685560 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 685560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1069200).

685560 is an abundant number, since it is smaller than the sum of its proper divisors (1452840).

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

685560 is a wasteful number, since it uses less digits than its factorization.

685560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 685560 is about 827.9855071195. The cubic root of 685560 is about 88.1756134985.

The spelling of 685560 in words is "six hundred eighty-five thousand, five hundred sixty".