28228523 has 2 divisors, whose sum is σ = 28228524. Its totient is φ = 28228522.

The previous prime is 28228481. The next prime is 28228553. The reversal of 28228523 is 32582282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28228523 - 2¹⁰ = 28227499 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28228523.

It is not a weakly prime, because it can be changed into another prime (28228553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14114261 + 14114262.

It is an arithmetic number, because the mean of its divisors is an integer number (14114262).

Almost surely, 2^28228523 is an apocalyptic number.

28228523 is a deficient number, since it is larger than the sum of its proper divisors (1).

28228523 is an equidigital number, since it uses as much as digits as its factorization.

28228523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 32.

The square root of 28228523 is about 5313.0521360137. The cubic root of 28228523 is about 304.4827675318.

The spelling of 28228523 in words is "twenty-eight million, two hundred twenty-eight thousand, five hundred twenty-three".