128278222089 has 8 divisors (see below), whose sum is σ = 174264754752. Its totient is φ = 83905252080.

The previous prime is 128278221979. The next prime is 128278222091. The reversal of 128278222089 is 980222872821.

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

It is not a de Polignac number, because 128278222089 - 2²⁴ = 128261444873 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128278222099) 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, 403390477 + ... + 403390794.

It is an arithmetic number, because the mean of its divisors is an integer number (21783094344).

Almost surely, 2^128278222089 is an apocalyptic number.

It is an amenable number.

128278222089 is a deficient number, since it is larger than the sum of its proper divisors (45986532663).

128278222089 is an equidigital number, since it uses as much as digits as its factorization.

128278222089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806781327.

The product of its (nonzero) digits is 1032192, while the sum is 51.

The spelling of 128278222089 in words is "one hundred twenty-eight billion, two hundred seventy-eight million, two hundred twenty-two thousand, eighty-nine".