128435289 has 32 divisors (see below), whose sum is σ = 190439424. Its totient is φ = 76581120.

The previous prime is 128435267. The next prime is 128435297. The reversal of 128435289 is 982534821.

It is not a de Polignac number, because 128435289 - 2⁵ = 128435257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128435289.

It is not an unprimeable number, because it can be changed into a prime (128435239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261334 + ... + 261824.

It is an arithmetic number, because the mean of its divisors is an integer number (5951232).

Almost surely, 2^128435289 is an apocalyptic number.

It is an amenable number.

128435289 is a deficient number, since it is larger than the sum of its proper divisors (62004135).

128435289 is a wasteful number, since it uses less digits than its factorization.

128435289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its digits is 138240, while the sum is 42.

The square root of 128435289 is about 11332.9294094687. The cubic root of 128435289 is about 504.5390546089.

The spelling of 128435289 in words is "one hundred twenty-eight million, four hundred thirty-five thousand, two hundred eighty-nine".