85128189 has 16 divisors (see below), whose sum is σ = 119993280. Its totient is φ = 53533440.

The previous prime is 85128179. The next prime is 85128191. The reversal of 85128189 is 98182158.

It is not a de Polignac number, because 85128189 - 2¹¹ = 85126141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85128189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85128119) 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, 10639 + ... + 16835.

It is an arithmetic number, because the mean of its divisors is an integer number (7499580).

Almost surely, 2^85128189 is an apocalyptic number.

It is an amenable number.

85128189 is a deficient number, since it is larger than the sum of its proper divisors (34865091).

85128189 is a wasteful number, since it uses less digits than its factorization.

85128189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460.

The product of its digits is 46080, while the sum is 42.

The square root of 85128189 is about 9226.4938627845. The cubic root of 85128189 is about 439.9038856866.

The spelling of 85128189 in words is "eighty-five million, one hundred twenty-eight thousand, one hundred eighty-nine".