128928727 has 2 divisors, whose sum is σ = 128928728. Its totient is φ = 128928726.

The previous prime is 128928719. The next prime is 128928733. The reversal of 128928727 is 727829821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128928727 - 2³ = 128928719 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128928707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64464363 + 64464364.

It is an arithmetic number, because the mean of its divisors is an integer number (64464364).

Almost surely, 2^128928727 is an apocalyptic number.

128928727 is a deficient number, since it is larger than the sum of its proper divisors (1).

128928727 is an equidigital number, since it uses as much as digits as its factorization.

128928727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 128928727 is about 11354.6786392218. The cubic root of 128928727 is about 505.1843616640.

The spelling of 128928727 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, seven hundred twenty-seven".