28038809 has 2 divisors, whose sum is σ = 28038810. Its totient is φ = 28038808.

The previous prime is 28038757. The next prime is 28038821. The reversal of 28038809 is 90883082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 107584 = 5285^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 28038809 - 2¹⁶ = 27973273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28038839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14019404 + 14019405.

It is an arithmetic number, because the mean of its divisors is an integer number (14019405).

Almost surely, 2^28038809 is an apocalyptic number.

It is an amenable number.

28038809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28038809 is an equidigital number, since it uses as much as digits as its factorization.

28038809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28038809 is about 5295.1684581324. The cubic root of 28038809 is about 303.7991264454.

The spelling of 28038809 in words is "twenty-eight million, thirty-eight thousand, eight hundred nine".