685635 has 16 divisors (see below), whose sum is σ = 1123584. Its totient is φ = 356832.

The previous prime is 685631. The next prime is 685637. The reversal of 685635 is 536586.

685635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685635 - 2² = 685631 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 685596 and 685605.

It is not an unprimeable number, because it can be changed into a prime (685631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (70224).

2⁶⁸⁵⁶³⁵ is an apocalyptic number.

685635 is a deficient number, since it is larger than the sum of its proper divisors (437949).

685635 is a wasteful number, since it uses less digits than its factorization.

685635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114.

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

The square root of 685635 is about 828.0307965287. The cubic root of 685635 is about 88.1788288406.

Adding to 685635 its reverse (536586), we get a palindrome (1222221).

The spelling of 685635 in words is "six hundred eighty-five thousand, six hundred thirty-five".