128026501789 has 8 divisors (see below), whose sum is σ = 133726890240. Its totient is φ = 122337281616.

The previous prime is 128026501777. The next prime is 128026501807. The reversal of 128026501789 is 987105620821.

It is a happy number.

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 128026501789 - 2⁷ = 128026501661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128026501709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2768629 + ... + 2814490.

It is an arithmetic number, because the mean of its divisors is an integer number (16715861280).

Almost surely, 2^128026501789 is an apocalyptic number.

It is an amenable number.

128026501789 is a deficient number, since it is larger than the sum of its proper divisors (5700388451).

128026501789 is an equidigital number, since it uses as much as digits as its factorization.

128026501789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584139.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 128026501789 in words is "one hundred twenty-eight billion, twenty-six million, five hundred one thousand, seven hundred eighty-nine".