685140 has 48 divisors (see below), whose sum is σ = 2022720. Its totient is φ = 172800.

The previous prime is 685123. The next prime is 685141. The reversal of 685140 is 41586.

It is a self number, because there is not a number n which added to its sum of digits gives 685140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685141) by changing a digit.

685140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (42140).

2⁶⁸⁵¹⁴⁰ is an apocalyptic number.

685140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1011360).

685140 is an abundant number, since it is smaller than the sum of its proper divisors (1337580).

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

685140 is a wasteful number, since it uses less digits than its factorization.

685140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 685140 is about 827.7318406344. The cubic root of 685140 is about 88.1576032475.

The spelling of 685140 in words is "six hundred eighty-five thousand, one hundred forty".