268931808 has 72 divisors (see below), whose sum is σ = 767625768. Its totient is φ = 89309952.

The previous prime is 268931783. The next prime is 268931813. The reversal of 268931808 is 808139862.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82791 + ... + 85977.

It is an arithmetic number, because the mean of its divisors is an integer number (10661469).

Almost surely, 2^268931808 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 268931808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383812884).

268931808 is an abundant number, since it is smaller than the sum of its proper divisors (498693960).

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

268931808 is a wasteful number, since it uses less digits than its factorization.

268931808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496 (or 3485 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 268931808 is about 16399.1404652805. The cubic root of 268931808 is about 645.4769286738.

The spelling of 268931808 in words is "two hundred sixty-eight million, nine hundred thirty-one thousand, eight hundred eight".