128191578887 has 8 divisors (see below), whose sum is σ = 138888824976. Its totient is φ = 117845062272.

The previous prime is 128191578839. The next prime is 128191578899. The reversal of 128191578887 is 788875191821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128191578887 - 2²⁸ = 127923143431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128191574887) 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 in 7 ways as a sum of consecutive naturals, for example, 87681608 + ... + 87683069.

It is an arithmetic number, because the mean of its divisors is an integer number (17361103122).

Almost surely, 2^128191578887 is an apocalyptic number.

128191578887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128191578887 is a deficient number, since it is larger than the sum of its proper divisors (10697246089).

128191578887 is a wasteful number, since it uses less digits than its factorization.

128191578887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175364737.

The product of its digits is 18063360, while the sum is 65.

The spelling of 128191578887 in words is "one hundred twenty-eight billion, one hundred ninety-one million, five hundred seventy-eight thousand, eight hundred eighty-seven".