686244 has 48 divisors (see below), whose sum is σ = 1778112. Its totient is φ = 204672.

The previous prime is 686209. The next prime is 686267. The reversal of 686244 is 442686.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

686244 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, 8227 + ... + 8309.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁶⁸⁶²⁴⁴ 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 686244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889056).

686244 is an abundant number, since it is smaller than the sum of its proper divisors (1091868).

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

686244 is a wasteful number, since it uses less digits than its factorization.

686244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 154 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 686244 is about 828.3984548513. The cubic root of 686244 is about 88.2049287408.

The spelling of 686244 in words is "six hundred eighty-six thousand, two hundred forty-four".