6628321 has 24 divisors (see below), whose sum is σ = 8314944. Its totient is φ = 5171040.

The previous prime is 6628313. The next prime is 6628357. The reversal of 6628321 is 1238266.

It is not a de Polignac number, because 6628321 - 2³ = 6628313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6628321.

It is not an unprimeable number, because it can be changed into a prime (6628421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108631 + ... + 108691.

It is an arithmetic number, because the mean of its divisors is an integer number (346456).

Almost surely, 2^6628321 is an apocalyptic number.

6628321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6628321 is a deficient number, since it is larger than the sum of its proper divisors (1686623).

6628321 is a wasteful number, since it uses less digits than its factorization.

6628321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 130 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 6628321 is about 2574.5525824888. The cubic root of 6628321 is about 187.8456651730.

The spelling of 6628321 in words is "six million, six hundred twenty-eight thousand, three hundred twenty-one".