6628399 has 4 divisors (see below), whose sum is σ = 6689320. Its totient is φ = 6567480.

The previous prime is 6628379. The next prime is 6628403. The reversal of 6628399 is 9938266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6628399 - 2⁵ = 6628367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628309) 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 3 ways as a sum of consecutive naturals, for example, 30297 + ... + 30514.

It is an arithmetic number, because the mean of its divisors is an integer number (1672330).

Almost surely, 2^6628399 is an apocalyptic number.

6628399 is a deficient number, since it is larger than the sum of its proper divisors (60921).

6628399 is a wasteful number, since it uses less digits than its factorization.

6628399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60920.

The product of its digits is 139968, while the sum is 43.

The square root of 6628399 is about 2574.5677307074. The cubic root of 6628399 is about 187.8464020064.

The spelling of 6628399 in words is "six million, six hundred twenty-eight thousand, three hundred ninety-nine".