685628 has 12 divisors (see below), whose sum is σ = 1207752. Its totient is φ = 340560.

The previous prime is 685621. The next prime is 685631. The reversal of 685628 is 826586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685621) by changing a digit.

685628 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251 + ... + 1197.

It is an arithmetic number, because the mean of its divisors is an integer number (100646).

2⁶⁸⁵⁶²⁸ is an apocalyptic number.

It is an amenable number.

685628 is a deficient number, since it is larger than the sum of its proper divisors (522124).

685628 is a wasteful number, since it uses less digits than its factorization.

685628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1130 counting only the distinct ones).

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

The square root of 685628 is about 828.0265696220. The cubic root of 685628 is about 88.1785287520.

The spelling of 685628 in words is "six hundred eighty-five thousand, six hundred twenty-eight".