331139808 has 72 divisors (see below), whose sum is σ = 952333200. Its totient is φ = 109131264.

The previous prime is 331139803. The next prime is 331139843. The reversal of 331139808 is 808931133.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331139803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19173 + ... + 32091.

It is an arithmetic number, because the mean of its divisors is an integer number (13226850).

Almost surely, 2^331139808 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 331139808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476166600).

331139808 is an abundant number, since it is smaller than the sum of its proper divisors (621193392).

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

331139808 is a wasteful number, since it uses less digits than its factorization.

331139808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13024 (or 13013 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 331139808 is about 18197.2472643529. The cubic root of 331139808 is about 691.8370204351.

The spelling of 331139808 in words is "three hundred thirty-one million, one hundred thirty-nine thousand, eight hundred eight".