685107808 has 216 divisors, whose sum is σ = 1811070576. Its totient is φ = 253693440.

The previous prime is 685107791. The next prime is 685107817. The reversal of 685107808 is 808701586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4363666 + ... + 4363822.

It is an arithmetic number, because the mean of its divisors is an integer number (8384586).

Almost surely, 2^685107808 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 685107808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905535288).

685107808 is an abundant number, since it is smaller than the sum of its proper divisors (1125962768).

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

685107808 is a wasteful number, since it uses less digits than its factorization.

685107808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 685107808 is about 26174.5641415478. The cubic root of 685107808 is about 881.5622250100.

The spelling of 685107808 in words is "six hundred eighty-five million, one hundred seven thousand, eight hundred eight".