128287707427 has 24 divisors (see below), whose sum is σ = 149946542928. Its totient is φ = 109293381120.

The previous prime is 128287707337. The next prime is 128287707467. The reversal of 128287707427 is 724707782821.

It is not a de Polignac number, because 128287707427 - 2²⁷ = 128153489699 is a prime.

It is a super-3 number, since 3×128287707427³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128287707467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345448 + ... + 613114.

It is an arithmetic number, because the mean of its divisors is an integer number (6247772622).

Almost surely, 2^128287707427 is an apocalyptic number.

128287707427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128287707427 is a deficient number, since it is larger than the sum of its proper divisors (21658835501).

128287707427 is a wasteful number, since it uses less digits than its factorization.

128287707427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267939 (or 267928 counting only the distinct ones).

The product of its (nonzero) digits is 4917248, while the sum is 55.

The spelling of 128287707427 in words is "one hundred twenty-eight billion, two hundred eighty-seven million, seven hundred seven thousand, four hundred twenty-seven".