6728399 has 2 divisors, whose sum is σ = 6728400. Its totient is φ = 6728398.

The previous prime is 6728383. The next prime is 6728401. The reversal of 6728399 is 9938276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6728399 - 2⁴ = 6728383 is a prime.

It is a Sophie Germain prime.

Together with 6728401, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6728369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3364199 + 3364200.

It is an arithmetic number, because the mean of its divisors is an integer number (3364200).

Almost surely, 2^6728399 is an apocalyptic number.

6728399 is a deficient number, since it is larger than the sum of its proper divisors (1).

6728399 is an equidigital number, since it uses as much as digits as its factorization.

6728399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 6728399 is about 2593.9157657873. The cubic root of 6728399 is about 188.7863453539.

The spelling of 6728399 in words is "six million, seven hundred twenty-eight thousand, three hundred ninety-nine".