331928 has 8 divisors (see below), whose sum is σ = 622380. Its totient is φ = 165960.

The previous prime is 331921. The next prime is 331937. The reversal of 331928 is 829133.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×331928² = 220352394368, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 331897 and 331906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331921) by changing a digit.

331928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20738 + ... + 20753.

2³³¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

331928 is a deficient number, since it is larger than the sum of its proper divisors (290452).

331928 is a wasteful number, since it uses less digits than its factorization.

331928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41497 (or 41493 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 331928 is about 576.1319293356. The cubic root of 331928 is about 69.2385498061.

The spelling of 331928 in words is "three hundred thirty-one thousand, nine hundred twenty-eight".