128807889 has 16 divisors (see below), whose sum is σ = 204813312. Its totient is φ = 70404048.

The previous prime is 128807881. The next prime is 128807911. The reversal of 128807889 is 988708821.

It is a happy number.

It is not a de Polignac number, because 128807889 - 2³ = 128807881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128807881) 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 15 ways as a sum of consecutive naturals, for example, 132859 + ... + 133824.

It is an arithmetic number, because the mean of its divisors is an integer number (12800832).

Almost surely, 2^128807889 is an apocalyptic number.

It is an amenable number.

128807889 is a deficient number, since it is larger than the sum of its proper divisors (76005423).

128807889 is a wasteful number, since it uses less digits than its factorization.

128807889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266716.

The product of its (nonzero) digits is 516096, while the sum is 51.

The square root of 128807889 is about 11349.3563253605. The cubic root of 128807889 is about 505.0264849032.

The spelling of 128807889 in words is "one hundred twenty-eight million, eight hundred seven thousand, eight hundred eighty-nine".