6628309 has 2 divisors, whose sum is σ = 6628310. Its totient is φ = 6628308.

The previous prime is 6628289. The next prime is 6628313. The reversal of 6628309 is 9038266.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6604900 + 23409 = 2570^2 + 153^2 .

It is a cyclic number.

It is not a de Polignac number, because 6628309 - 2⁵ = 6628277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6628379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3314154 + 3314155.

It is an arithmetic number, because the mean of its divisors is an integer number (3314155).

Almost surely, 2^6628309 is an apocalyptic number.

It is an amenable number.

6628309 is a deficient number, since it is larger than the sum of its proper divisors (1).

6628309 is an equidigital number, since it uses as much as digits as its factorization.

6628309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 6628309 is about 2574.5502519858. The cubic root of 6628309 is about 187.8455518135.

The spelling of 6628309 in words is "six million, six hundred twenty-eight thousand, three hundred nine".