685757 has 6 divisors (see below), whose sum is σ = 701118. Its totient is φ = 670712.

The previous prime is 685753. The next prime is 685759. The reversal of 685757 is 757586.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 3481 = 826^2 + 59^2 .

It is not a de Polignac number, because 685757 - 2² = 685753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3383 + ... + 3579.

It is an arithmetic number, because the mean of its divisors is an integer number (116853).

2⁶⁸⁵⁷⁵⁷ is an apocalyptic number.

It is an amenable number.

685757 is a deficient number, since it is larger than the sum of its proper divisors (15361).

685757 is an equidigital number, since it uses as much as digits as its factorization.

685757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 256 counting only the distinct ones).

The product of its digits is 58800, while the sum is 38.

The square root of 685757 is about 828.1044620095. The cubic root of 685757 is about 88.1840586296.

The spelling of 685757 in words is "six hundred eighty-five thousand, seven hundred fifty-seven".