685908 has 60 divisors (see below), whose sum is σ = 1880340. Its totient is φ = 217728.

The previous prime is 685907. The next prime is 685939. The reversal of 685908 is 809586.

685908 is a `hidden beast` number, since 68 + 590 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 374544 + 311364 = 612^2 + 558^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685908.

It is not an unprimeable number, because it can be changed into a prime (685907) 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 19 ways as a sum of consecutive naturals, for example, 9360 + ... + 9432.

It is an arithmetic number, because the mean of its divisors is an integer number (31339).

2⁶⁸⁵⁹⁰⁸ 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 685908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940170).

685908 is an abundant number, since it is smaller than the sum of its proper divisors (1194432).

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

685908 is a wasteful number, since it uses less digits than its factorization.

685908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 685908 is about 828.1956290636. The cubic root of 685908 is about 88.1905307063.

The spelling of 685908 in words is "six hundred eighty-five thousand, nine hundred eight".