686528 has 28 divisors (see below), whose sum is σ = 1444752. Its totient is φ = 322560.

The previous prime is 686519. The next prime is 686551. The reversal of 686528 is 825686.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686528.

It is an unprimeable number.

686528 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 3 ways as a sum of consecutive naturals, for example, 773 + ... + 1403.

2⁶⁸⁶⁵²⁸ is an apocalyptic number.

686528 is a gapful number since it is divisible by the number (68) 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 686528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722376).

686528 is an abundant number, since it is smaller than the sum of its proper divisors (758224).

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

686528 is a wasteful number, since it uses less digits than its factorization.

686528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 650 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 686528 is about 828.5698522152. The cubic root of 686528 is about 88.2170948435.

The spelling of 686528 in words is "six hundred eighty-six thousand, five hundred twenty-eight".