128388234777487 has 4 divisors (see below), whose sum is σ = 128392451308800. Its totient is φ = 128384018246176.

The previous prime is 128388234777449. The next prime is 128388234777521. The reversal of 128388234777487 is 784777432883821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128388234777487 - 2¹⁵ = 128388234744719 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 (128388234777427) 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 3 ways as a sum of consecutive naturals, for example, 2108219983 + ... + 2108280880.

It is an arithmetic number, because the mean of its divisors is an integer number (32098112827200).

Almost surely, 2^{128388234777487} is an apocalyptic number.

128388234777487 is a deficient number, since it is larger than the sum of its proper divisors (4216531313).

128388234777487 is an equidigital number, since it uses as much as digits as its factorization.

128388234777487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216531312.

The product of its digits is 5664669696, while the sum is 79.

The spelling of 128388234777487 in words is "one hundred twenty-eight trillion, three hundred eighty-eight billion, two hundred thirty-four million, seven hundred seventy-seven thousand, four hundred eighty-seven".