685636 has 24 divisors (see below), whose sum is σ = 1403136. Its totient is φ = 287040.

The previous prime is 685631. The next prime is 685637. The reversal of 685636 is 636586.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (685631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (58464).

2⁶⁸⁵⁶³⁶ 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 685636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701568).

685636 is an abundant number, since it is smaller than the sum of its proper divisors (717500).

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

685636 is a wasteful number, since it uses less digits than its factorization.

685636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 577 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 685636 is about 828.0314003708. The cubic root of 685636 is about 88.1788717103.

The spelling of 685636 in words is "six hundred eighty-five thousand, six hundred thirty-six".