685650 has 48 divisors (see below), whose sum is σ = 1946304. Its totient is φ = 156480.

The previous prime is 685649. The next prime is 685669. The reversal of 685650 is 56586.

685650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 724 + ... + 1376.

It is an arithmetic number, because the mean of its divisors is an integer number (40548).

2⁶⁸⁵⁶⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973152).

685650 is an abundant number, since it is smaller than the sum of its proper divisors (1260654).

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

685650 is a wasteful number, since it uses less digits than its factorization.

685650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 670 counting only the distinct ones).

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

The square root of 685650 is about 828.0398541133. The cubic root of 685650 is about 88.1794718809.

The spelling of 685650 in words is "six hundred eighty-five thousand, six hundred fifty".