128213729289 has 24 divisors (see below), whose sum is σ = 193751131392. Its totient is φ = 81616754880.

The previous prime is 128213729201. The next prime is 128213729311. The reversal of 128213729289 is 982927312821.

128213729289 is a `hidden beast` number, since 1 + 282 + 13 + 72 + 9 + 289 = 666.

It is not a de Polignac number, because 128213729289 - 2²⁴ = 128196952073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128213721289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3679069 + ... + 3713754.

It is an arithmetic number, because the mean of its divisors is an integer number (8072963808).

Almost surely, 2^128213729289 is an apocalyptic number.

It is an amenable number.

128213729289 is a deficient number, since it is larger than the sum of its proper divisors (65537402103).

128213729289 is a wasteful number, since it uses less digits than its factorization.

128213729289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7392917 (or 7392914 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 128213729289 in words is "one hundred twenty-eight billion, two hundred thirteen million, seven hundred twenty-nine thousand, two hundred eighty-nine".