128135289 has 8 divisors (see below), whose sum is σ = 173397280. Its totient is φ = 84148416.

The previous prime is 128135269. The next prime is 128135299. The reversal of 128135289 is 982531821.

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

It is not a de Polignac number, because 128135289 - 2²⁴ = 111358073 is a prime.

It is a super-2 number, since 2×128135289² = 32837304574227042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128135219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318544 + ... + 318945.

It is an arithmetic number, because the mean of its divisors is an integer number (21674660).

Almost surely, 2^128135289 is an apocalyptic number.

It is an amenable number.

128135289 is a deficient number, since it is larger than the sum of its proper divisors (45261991).

128135289 is an equidigital number, since it uses as much as digits as its factorization.

128135289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637559.

The product of its digits is 34560, while the sum is 39.

The square root of 128135289 is about 11319.6859055364. The cubic root of 128135289 is about 504.1459131255.

The spelling of 128135289 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, two hundred eighty-nine".