6628805 has 4 divisors (see below), whose sum is σ = 7954572. Its totient is φ = 5303040.

The previous prime is 6628781. The next prime is 6628813. The reversal of 6628805 is 5088266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5088266 = 2 ⋅2544133.

It can be written as a sum of positive squares in 2 ways, for example, as 3363556 + 3265249 = 1834^2 + 1807^2 .

It is not a de Polignac number, because 6628805 - 2¹⁶ = 6563269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 662876 + ... + 662885.

It is an arithmetic number, because the mean of its divisors is an integer number (1988643).

Almost surely, 2^6628805 is an apocalyptic number.

It is an amenable number.

6628805 is a deficient number, since it is larger than the sum of its proper divisors (1325767).

6628805 is a wasteful number, since it uses less digits than its factorization.

6628805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325766.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 6628805 is about 2574.6465776879. The cubic root of 6628805 is about 187.8502372252.

The spelling of 6628805 in words is "six million, six hundred twenty-eight thousand, eight hundred five".