128728519 has 2 divisors, whose sum is σ = 128728520. Its totient is φ = 128728518.

The previous prime is 128728511. The next prime is 128728531. The reversal of 128728519 is 915827821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (915827821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128728519 - 2³ = 128728511 is a prime.

It is a super-2 number, since 2×128728519² = 33142063207866722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128728511) 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, 64364259 + 64364260.

It is an arithmetic number, because the mean of its divisors is an integer number (64364260).

Almost surely, 2^128728519 is an apocalyptic number.

128728519 is a deficient number, since it is larger than the sum of its proper divisors (1).

128728519 is an equidigital number, since it uses as much as digits as its factorization.

128728519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 128728519 is about 11345.8591124692. The cubic root of 128728519 is about 504.9227330074.

The spelling of 128728519 in words is "one hundred twenty-eight million, seven hundred twenty-eight thousand, five hundred nineteen".