6628809 has 32 divisors (see below), whose sum is σ = 10177920. Its totient is φ = 3801600.

The previous prime is 6628781. The next prime is 6628813. The reversal of 6628809 is 9088266.

It is not a de Polignac number, because 6628809 - 2⁸ = 6628553 is a prime.

It is a super-2 number, since 2×6628809² = 87882217516962, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

6628809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6628819) 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 31 ways as a sum of consecutive naturals, for example, 74437 + ... + 74525.

It is an arithmetic number, because the mean of its divisors is an integer number (318060).

Almost surely, 2^6628809 is an apocalyptic number.

It is an amenable number.

6628809 is a deficient number, since it is larger than the sum of its proper divisors (3549111).

6628809 is a wasteful number, since it uses less digits than its factorization.

6628809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 6628809 is about 2574.6473544934. The cubic root of 6628809 is about 187.8502750099.

The spelling of 6628809 in words is "six million, six hundred twenty-eight thousand, eight hundred nine".