128871 has 20 divisors (see below), whose sum is σ = 202312. Its totient is φ = 81648.

The previous prime is 128861. The next prime is 128873. The reversal of 128871 is 178821.

It is not a de Polignac number, because 128871 - 2¹¹ = 126823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

128871 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128873) 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 19 ways as a sum of consecutive naturals, for example, 2976 + ... + 3018.

2¹²⁸⁸⁷¹ is an apocalyptic number.

128871 is a deficient number, since it is larger than the sum of its proper divisors (73441).

128871 is an equidigital number, since it uses as much as digits as its factorization.

128871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 83 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 128871 is about 358.9860721532. The cubic root of 128871 is about 50.5108952736.

It can be divided in two parts, 128 and 871, that added together give a palindrome (999).

The spelling of 128871 in words is "one hundred twenty-eight thousand, eight hundred seventy-one".