685828 has 36 divisors (see below), whose sum is σ = 1433740. Its totient is φ = 285120.

The previous prime is 685819. The next prime is 685849. The reversal of 685828 is 828586.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 407044 = 528^2 + 638^2 .

It is a nialpdrome in base 7.

It is an unprimeable number.

685828 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 11 ways as a sum of consecutive naturals, for example, 6238 + ... + 6346.

2⁶⁸⁵⁸²⁸ is an apocalyptic number.

It is an amenable number.

685828 is an abundant number, since it is smaller than the sum of its proper divisors (747912).

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

685828 is a wasteful number, since it uses less digits than its factorization.

685828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 135 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 685828 is about 828.1473298876. The cubic root of 685828 is about 88.1871019098.

It can be divided in two parts, 6858 and 28, that added together give a palindrome (6886).

The spelling of 685828 in words is "six hundred eighty-five thousand, eight hundred twenty-eight".