128778227 has 2 divisors, whose sum is σ = 128778228. Its totient is φ = 128778226.

The previous prime is 128778217. The next prime is 128778271. The reversal of 128778227 is 722877821.

It is an a-pointer prime, because the next prime (128778271) can be obtained adding 128778227 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128778227 - 2¹⁰ = 128777203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128778217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64389113 + 64389114.

It is an arithmetic number, because the mean of its divisors is an integer number (64389114).

Almost surely, 2^128778227 is an apocalyptic number.

128778227 is a deficient number, since it is larger than the sum of its proper divisors (1).

128778227 is an equidigital number, since it uses as much as digits as its factorization.

128778227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 175616, while the sum is 44.

The square root of 128778227 is about 11348.0494799767. The cubic root of 128778227 is about 504.9877159382.

The spelling of 128778227 in words is "one hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred twenty-seven".