321028 has 12 divisors (see below), whose sum is σ = 594972. Its totient is φ = 151040.

The previous prime is 321017. The next prime is 321031. The reversal of 321028 is 820123.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 107584 = 462^2 + 328^2 .

It is an unprimeable number.

321028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2293 + ... + 2428.

It is an arithmetic number, because the mean of its divisors is an integer number (49581).

2³²¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

321028 is a deficient number, since it is larger than the sum of its proper divisors (273944).

321028 is a wasteful number, since it uses less digits than its factorization.

321028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742 (or 4740 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 321028 is about 566.5933285876. The cubic root of 321028 is about 68.4722035444.

It can be divided in two parts, 32 and 1028, that multiplied together give a triangular number (32896 = T₂₅₆).

The spelling of 321028 in words is "three hundred twenty-one thousand, twenty-eight".