685950 has 48 divisors (see below), whose sum is σ = 1807920. Its totient is φ = 171520.

The previous prime is 685939. The next prime is 685963. The reversal of 685950 is 59586.

685950 = 65² + 66² + ... + 132².

It is a congruent number.

It is an unprimeable number.

685950 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 23 ways as a sum of consecutive naturals, for example, 2416 + ... + 2684.

It is an arithmetic number, because the mean of its divisors is an integer number (37665).

2⁶⁸⁵⁹⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903960).

685950 is an abundant number, since it is smaller than the sum of its proper divisors (1121970).

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

685950 is a wasteful number, since it uses less digits than its factorization.

685950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 685950 is about 828.2209850034. The cubic root of 685950 is about 88.1923307177.

The spelling of 685950 in words is "six hundred eighty-five thousand, nine hundred fifty".