685758 has 16 divisors (see below), whose sum is σ = 1409040. Its totient is φ = 222336.

The previous prime is 685753. The next prime is 685759. The reversal of 685758 is 857586.

It is a happy number.

It is an Ulam number.

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 685758.

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

685758 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 1323 + ... + 1766.

It is an arithmetic number, because the mean of its divisors is an integer number (88065).

2⁶⁸⁵⁷⁵⁸ is an apocalyptic number.

685758 is an abundant number, since it is smaller than the sum of its proper divisors (723282).

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

685758 is a wasteful number, since it uses less digits than its factorization.

685758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131.

The product of its digits is 67200, while the sum is 39.

The square root of 685758 is about 828.1050657978. The cubic root of 685758 is about 88.1841014942.

The spelling of 685758 in words is "six hundred eighty-five thousand, seven hundred fifty-eight".