685000 has 40 divisors (see below), whose sum is σ = 1616670. Its totient is φ = 272000.

The previous prime is 684989. The next prime is 685001. The reversal of 685000 is 586.

685000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 15876 + 669124 = 126^2 + 818^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (685001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4932 + ... + 5068.

2⁶⁸⁵⁰⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808335).

685000 is an abundant number, since it is smaller than the sum of its proper divisors (931670).

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

685000 is a wasteful number, since it uses less digits than its factorization.

685000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 685000 is about 827.6472678623. The cubic root of 685000 is about 88.1515981949.

Adding to 685000 its reverse (586), we get a palindrome (685586).

The spelling of 685000 in words is "six hundred eighty-five thousand".