28128728227 has 2 divisors, whose sum is σ = 28128728228. Its totient is φ = 28128728226.

The previous prime is 28128728219. The next prime is 28128728231. The reversal of 28128728227 is 72282782182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28128728227 - 2³ = 28128728219 is a prime.

It is not a weakly prime, because it can be changed into another prime (28128728237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064364113 + 14064364114.

It is an arithmetic number, because the mean of its divisors is an integer number (14064364114).

Almost surely, 2^28128728227 is an apocalyptic number.

28128728227 is a deficient number, since it is larger than the sum of its proper divisors (1).

28128728227 is an equidigital number, since it uses as much as digits as its factorization.

28128728227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 802816, while the sum is 49.

The spelling of 28128728227 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred twenty-eight thousand, two hundred twenty-seven".