128170899 has 6 divisors (see below), whose sum is σ = 185135756. Its totient is φ = 85447260.

The previous prime is 128170897. The next prime is 128170909. The reversal of 128170899 is 998071821.

It is not a de Polignac number, because 128170899 - 2¹ = 128170897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128170897) 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 5 ways as a sum of consecutive naturals, for example, 7120597 + ... + 7120614.

Almost surely, 2^128170899 is an apocalyptic number.

128170899 is a deficient number, since it is larger than the sum of its proper divisors (56964857).

128170899 is a wasteful number, since it uses less digits than its factorization.

128170899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241217 (or 14241214 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 128170899 is about 11321.2587197714. The cubic root of 128170899 is about 504.1926110942.

The spelling of 128170899 in words is "one hundred twenty-eight million, one hundred seventy thousand, eight hundred ninety-nine".