28128728219 has 2 divisors, whose sum is σ = 28128728220. Its totient is φ = 28128728218.

The previous prime is 28128728203. The next prime is 28128728227. The reversal of 28128728219 is 91282782182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28128728219 - 2⁴ = 28128728203 is a prime.

It is a super-2 number, since 2×28128728219² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28128728249) 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, 14064364109 + 14064364110.

It is an arithmetic number, because the mean of its divisors is an integer number (14064364110).

Almost surely, 2^28128728219 is an apocalyptic number.

28128728219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28128728219 is an equidigital number, since it uses as much as digits as its factorization.

28128728219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 50.

The spelling of 28128728219 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred twenty-eight thousand, two hundred nineteen".