331193728 has 32 divisors (see below), whose sum is σ = 698616360. Its totient is φ = 155854848.

The previous prime is 331193713. The next prime is 331193729. The reversal of 331193728 is 827391133.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331193729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73926 + ... + 78277.

Almost surely, 2^331193728 is an apocalyptic number.

It is an amenable number.

331193728 is an abundant number, since it is smaller than the sum of its proper divisors (367422632).

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

331193728 is a wasteful number, since it uses less digits than its factorization.

331193728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152234 (or 152222 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 331193728 is about 18198.7287468109. The cubic root of 331193728 is about 691.8745693562.

The spelling of 331193728 in words is "three hundred thirty-one million, one hundred ninety-three thousand, seven hundred twenty-eight".