128755719 has 12 divisors (see below), whose sum is σ = 186100200. Its totient is φ = 85781904.

The previous prime is 128755687. The next prime is 128755729. The reversal of 128755719 is 917557821.

128755719 is a `hidden beast` number, since 1 + 2 + 8 + 75 + 571 + 9 = 666.

It is not a de Polignac number, because 128755719 - 2⁵ = 128755687 is a prime.

It is a super-2 number, since 2×128755719² = 33156070350413922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128755729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14197 + ... + 21425.

It is an arithmetic number, because the mean of its divisors is an integer number (15508350).

Almost surely, 2^128755719 is an apocalyptic number.

128755719 is a deficient number, since it is larger than the sum of its proper divisors (57344481).

128755719 is a wasteful number, since it uses less digits than its factorization.

128755719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9214 (or 9211 counting only the distinct ones).

The product of its digits is 176400, while the sum is 45.

The square root of 128755719 is about 11347.0577243619. The cubic root of 128755719 is about 504.9582934547.

The spelling of 128755719 in words is "one hundred twenty-eight million, seven hundred fifty-five thousand, seven hundred nineteen".