128989233 has 32 divisors (see below), whose sum is σ = 207667200. Its totient is φ = 78829200.

The previous prime is 128989219. The next prime is 128989243. The reversal of 128989233 is 332989821.

It is not a de Polignac number, because 128989233 - 2⁹ = 128988721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128989243) 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, 11848 + ... + 19958.

It is an arithmetic number, because the mean of its divisors is an integer number (6489600).

Almost surely, 2^128989233 is an apocalyptic number.

It is an amenable number.

128989233 is a deficient number, since it is larger than the sum of its proper divisors (78677967).

128989233 is a wasteful number, since it uses less digits than its factorization.

128989233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8170 (or 8164 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 128989233 is about 11357.3426909643. The cubic root of 128989233 is about 505.2633766498.

The spelling of 128989233 in words is "one hundred twenty-eight million, nine hundred eighty-nine thousand, two hundred thirty-three".