685535 has 8 divisors (see below), whose sum is σ = 828576. Its totient is φ = 544480.

The previous prime is 685519. The next prime is 685537. The reversal of 685535 is 535586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685535 - 2⁴ = 685519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (103572).

2⁶⁸⁵⁵³⁵ is an apocalyptic number.

685535 is a deficient number, since it is larger than the sum of its proper divisors (143041).

685535 is a wasteful number, since it uses less digits than its factorization.

685535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993.

The product of its digits is 18000, while the sum is 32.

The square root of 685535 is about 827.9704100993. The cubic root of 685535 is about 88.1745416657.

The spelling of 685535 in words is "six hundred eighty-five thousand, five hundred thirty-five".