6628816 has 20 divisors (see below), whose sum is σ = 13087332. Its totient is φ = 3251456.

The previous prime is 6628813. The next prime is 6628819. The reversal of 6628816 is 6188266.

It is an interprime number because it is at equal distance from previous prime (6628813) and next prime (6628819).

It can be written as a sum of positive squares in 2 ways, for example, as 1700416 + 4928400 = 1304^2 + 2220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3061 + ... + 4756.

Almost surely, 2^6628816 is an apocalyptic number.

It is an amenable number.

6628816 is a deficient number, since it is larger than the sum of its proper divisors (6458516).

6628816 is a wasteful number, since it uses less digits than its factorization.

6628816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878 (or 7872 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 6628816 is about 2574.6487139025. The cubic root of 6628816 is about 187.8503411329.

It can be divided in two parts, 66 and 28816, that added together give a palindrome (28882).

The spelling of 6628816 in words is "six million, six hundred twenty-eight thousand, eight hundred sixteen".