685653 has 16 divisors (see below), whose sum is σ = 1006080. Its totient is φ = 413424.

The previous prime is 685649. The next prime is 685669. The reversal of 685653 is 356586.

It is not a de Polignac number, because 685653 - 2² = 685649 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685613) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1050 + ... + 1572.

It is an arithmetic number, because the mean of its divisors is an integer number (62880).

2⁶⁸⁵⁶⁵³ is an apocalyptic number.

It is an amenable number.

685653 is a deficient number, since it is larger than the sum of its proper divisors (320427).

685653 is a wasteful number, since it uses less digits than its factorization.

685653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568.

The product of its digits is 21600, while the sum is 33.

The square root of 685653 is about 828.0416656183. The cubic root of 685653 is about 88.1796004879.

The spelling of 685653 in words is "six hundred eighty-five thousand, six hundred fifty-three".