685568 has 40 divisors (see below), whose sum is σ = 1489488. Its totient is φ = 313344.

The previous prime is 685547. The next prime is 685591. The reversal of 685568 is 865586.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6605 + ... + 6707.

2⁶⁸⁵⁵⁶⁸ 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 685568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744744).

685568 is an abundant number, since it is smaller than the sum of its proper divisors (803920).

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

685568 is a wasteful number, since it uses less digits than its factorization.

685568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 118 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 685568 is about 827.9903381079. The cubic root of 685568 is about 88.1759564795.

The spelling of 685568 in words is "six hundred eighty-five thousand, five hundred sixty-eight".