128765271 has 8 divisors (see below), whose sum is σ = 172998144. Its totient is φ = 85187960.

The previous prime is 128765257. The next prime is 128765279. The reversal of 128765271 is 172567821.

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 128765271 - 2⁵ = 128765239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128765279) 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 7 ways as a sum of consecutive naturals, for example, 163431 + ... + 164216.

It is an arithmetic number, because the mean of its divisors is an integer number (21624768).

Almost surely, 2^128765271 is an apocalyptic number.

128765271 is a deficient number, since it is larger than the sum of its proper divisors (44232873).

128765271 is a wasteful number, since it uses less digits than its factorization.

128765271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327781.

The product of its digits is 47040, while the sum is 39.

The square root of 128765271 is about 11347.4786186183. The cubic root of 128765271 is about 504.9707802588.

The spelling of 128765271 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, two hundred seventy-one".