685542 has 64 divisors (see below), whose sum is σ = 1741824. Its totient is φ = 176640.

The previous prime is 685541. The next prime is 685547. The reversal of 685542 is 245586.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14563 + ... + 14609.

It is an arithmetic number, because the mean of its divisors is an integer number (27216).

2⁶⁸⁵⁵⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870912).

685542 is an abundant number, since it is smaller than the sum of its proper divisors (1056282).

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

685542 is a wasteful number, since it uses less digits than its factorization.

685542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93.

The product of its digits is 9600, while the sum is 30.

The square root of 685542 is about 827.9746372927. The cubic root of 685542 is about 88.1748417815.

The spelling of 685542 in words is "six hundred eighty-five thousand, five hundred forty-two".