331791228 has 42 divisors (see below), whose sum is σ = 870561384. Its totient is φ = 110596104.

The previous prime is 331791223. The next prime is 331791269. The reversal of 331791228 is 822197133.

It is a super-2 number, since 2×331791228² = 220170837955495968, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 331791192 and 331791201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331791223) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 53976 + ... + 59807.

It is an arithmetic number, because the mean of its divisors is an integer number (20727652).

Almost surely, 2^331791228 is an apocalyptic number.

It is an amenable number.

331791228 is an abundant number, since it is smaller than the sum of its proper divisors (538770156).

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

331791228 is a wasteful number, since it uses less digits than its factorization.

331791228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113805 (or 113788 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 331791228 is about 18215.1373313516. The cubic root of 331791228 is about 692.2903851058.

The spelling of 331791228 in words is "three hundred thirty-one million, seven hundred ninety-one thousand, two hundred twenty-eight".