331628 has 12 divisors (see below), whose sum is σ = 633192. Its totient is φ = 150720.

The previous prime is 331613. The next prime is 331651. The reversal of 331628 is 826133.

It is an Ulam number.

It is an unprimeable number.

331628 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 in 3 ways as a sum of consecutive naturals, for example, 3725 + ... + 3812.

It is an arithmetic number, because the mean of its divisors is an integer number (52766).

2³³¹⁶²⁸ is an apocalyptic number.

It is an amenable number.

331628 is a deficient number, since it is larger than the sum of its proper divisors (301564).

331628 is a wasteful number, since it uses less digits than its factorization.

331628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552 (or 7550 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 331628 is about 575.8715134472. The cubic root of 331628 is about 69.2176840100.

It can be divided in two parts, 331 and 628, that added together give a palindrome (959).

The spelling of 331628 in words is "three hundred thirty-one thousand, six hundred twenty-eight".