28091711 has 2 divisors, whose sum is σ = 28091712. Its totient is φ = 28091710.

The previous prime is 28091677. The next prime is 28091731. The reversal of 28091711 is 11719082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28091711 - 2¹⁰ = 28090687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28091731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045855 + 14045856.

It is an arithmetic number, because the mean of its divisors is an integer number (14045856).

Almost surely, 2^28091711 is an apocalyptic number.

28091711 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091711 is an equidigital number, since it uses as much as digits as its factorization.

28091711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 28091711 is about 5300.1614126364. The cubic root of 28091711 is about 303.9900699376.

The spelling of 28091711 in words is "twenty-eight million, ninety-one thousand, seven hundred eleven".