28709227 has 2 divisors, whose sum is σ = 28709228. Its totient is φ = 28709226.

The previous prime is 28709201. The next prime is 28709231. The reversal of 28709227 is 72290782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28709227 - 2¹¹ = 28707179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28709237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14354613 + 14354614.

It is an arithmetic number, because the mean of its divisors is an integer number (14354614).

Almost surely, 2^28709227 is an apocalyptic number.

28709227 is the 3094-th hex number.

28709227 is a deficient number, since it is larger than the sum of its proper divisors (1).

28709227 is an equidigital number, since it uses as much as digits as its factorization.

28709227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28709227 is about 5358.0991965435. The cubic root of 28709227 is about 306.2013960351.

The spelling of 28709227 in words is "twenty-eight million, seven hundred nine thousand, two hundred twenty-seven".