128877189 has 32 divisors (see below), whose sum is σ = 204042240. Its totient is φ = 70795200.

The previous prime is 128877163. The next prime is 128877197. The reversal of 128877189 is 981778821.

It is not a de Polignac number, because 128877189 - 2⁵ = 128877157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128877989) 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 31 ways as a sum of consecutive naturals, for example, 262234 + ... + 262724.

It is an arithmetic number, because the mean of its divisors is an integer number (6376320).

Almost surely, 2^128877189 is an apocalyptic number.

It is an amenable number.

128877189 is a deficient number, since it is larger than the sum of its proper divisors (75165051).

128877189 is a wasteful number, since it uses less digits than its factorization.

128877189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its digits is 451584, while the sum is 51.

The square root of 128877189 is about 11352.4089514076. The cubic root of 128877189 is about 505.1170385203.

The spelling of 128877189 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, one hundred eighty-nine".