128871899 has 8 divisors (see below), whose sum is σ = 140059920. Its totient is φ = 117866016.

The previous prime is 128871893. The next prime is 128871913. The reversal of 128871899 is 998178821.

It is a happy number.

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 128871899 - 2²⁴ = 112094683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128871899.

It is not an unprimeable number, because it can be changed into a prime (128871893) 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 in 7 ways as a sum of consecutive naturals, for example, 44057 + ... + 46890.

It is an arithmetic number, because the mean of its divisors is an integer number (17507490).

Almost surely, 2^128871899 is an apocalyptic number.

128871899 is a deficient number, since it is larger than the sum of its proper divisors (11188021).

128871899 is a wasteful number, since it uses less digits than its factorization.

128871899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91069.

The product of its digits is 580608, while the sum is 53.

The square root of 128871899 is about 11352.1759588195. The cubic root of 128871899 is about 505.1101272747.

The spelling of 128871899 in words is "one hundred twenty-eight million, eight hundred seventy-one thousand, eight hundred ninety-nine".