128549289 has 8 divisors (see below), whose sum is σ = 186980832. Its totient is φ = 77908640.

The previous prime is 128549287. The next prime is 128549299. The reversal of 128549289 is 982945821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128549289 - 2¹ = 128549287 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128549287) 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 7 ways as a sum of consecutive naturals, for example, 1947684 + ... + 1947749.

It is an arithmetic number, because the mean of its divisors is an integer number (23372604).

Almost surely, 2^128549289 is an apocalyptic number.

It is an amenable number.

128549289 is a deficient number, since it is larger than the sum of its proper divisors (58431543).

128549289 is a wasteful number, since it uses less digits than its factorization.

128549289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895447.

The product of its digits is 414720, while the sum is 48.

The square root of 128549289 is about 11337.9578849103. The cubic root of 128549289 is about 504.6882878491.

The spelling of 128549289 in words is "one hundred twenty-eight million, five hundred forty-nine thousand, two hundred eighty-nine".