685740 has 48 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 166080.

The previous prime is 685739. The next prime is 685747. The reversal of 685740 is 47586.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 685698 and 685707.

It is not an unprimeable number, because it can be changed into a prime (685747) 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, 141 + ... + 1179.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁶⁸⁵⁷⁴⁰ is an apocalyptic number.

685740 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 685740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048320).

685740 is an abundant number, since it is smaller than the sum of its proper divisors (1410900).

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

685740 is a wasteful number, since it uses less digits than its factorization.

685740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 685740 is about 828.0941975404. The cubic root of 685740 is about 88.1833299257.

The spelling of 685740 in words is "six hundred eighty-five thousand, seven hundred forty".