28067209 has 2 divisors, whose sum is σ = 28067210. Its totient is φ = 28067208.

The previous prime is 28067177. The next prime is 28067213. The reversal of 28067209 is 90276082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 12638025 = 3928^2 + 3555^2 .

It is a cyclic number.

It is not a de Polignac number, because 28067209 - 2⁵ = 28067177 is a prime.

It is not a weakly prime, because it can be changed into another prime (28067269) 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 as a sum of consecutive naturals, namely, 14033604 + 14033605.

It is an arithmetic number, because the mean of its divisors is an integer number (14033605).

Almost surely, 2^28067209 is an apocalyptic number.

It is an amenable number.

28067209 is a deficient number, since it is larger than the sum of its proper divisors (1).

28067209 is an equidigital number, since it uses as much as digits as its factorization.

28067209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28067209 is about 5297.8494693602. The cubic root of 28067209 is about 303.9016627053.

The spelling of 28067209 in words is "twenty-eight million, sixty-seven thousand, two hundred nine".