6628840 has 16 divisors (see below), whose sum is σ = 14914980. Its totient is φ = 2651520.

The previous prime is 6628819. The next prime is 6628847. The reversal of 6628840 is 488266.

It can be written as a sum of positive squares in 2 ways, for example, as 6625476 + 3364 = 2574^2 + 58^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6628796 and 6628805.

It is not an unprimeable number, because it can be changed into a prime (6628847) 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, 82821 + ... + 82900.

Almost surely, 2^6628840 is an apocalyptic number.

It is an amenable number.

6628840 is an abundant number, since it is smaller than the sum of its proper divisors (8286140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6628840 is a wasteful number, since it uses less digits than its factorization.

6628840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165732 (or 165728 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 6628840 is about 2574.6533747283. The cubic root of 6628840 is about 187.8505678402.

The spelling of 6628840 in words is "six million, six hundred twenty-eight thousand, eight hundred forty".