331321628 has 24 divisors (see below), whose sum is σ = 633118080. Its totient is φ = 150459120.

The previous prime is 331321621. The next prime is 331321631. The reversal of 331321628 is 826123133.

It is a self number, because there is not a number n which added to its sum of digits gives 331321628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331321621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54443 + ... + 60221.

It is an arithmetic number, because the mean of its divisors is an integer number (26379920).

Almost surely, 2^331321628 is an apocalyptic number.

It is an amenable number.

331321628 is a deficient number, since it is larger than the sum of its proper divisors (301796452).

331321628 is a wasteful number, since it uses less digits than its factorization.

331321628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7097 (or 7095 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 331321628 is about 18202.2423893321. The cubic root of 331321628 is about 691.9636203268.

The spelling of 331321628 in words is "three hundred thirty-one million, three hundred twenty-one thousand, six hundred twenty-eight".