128782640138039 has 4 divisors (see below), whose sum is σ = 134381885361456. Its totient is φ = 123183394914624.

The previous prime is 128782640137997. The next prime is 128782640138069. The reversal of 128782640138039 is 930831046287821.

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 128782640138039 - 2⁸ = 128782640137783 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 (128782640138069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799622611674 + ... + 2799622611719.

It is an arithmetic number, because the mean of its divisors is an integer number (33595471340364).

Almost surely, 2^{128782640138039} is an apocalyptic number.

128782640138039 is a deficient number, since it is larger than the sum of its proper divisors (5599245223417).

128782640138039 is an equidigital number, since it uses as much as digits as its factorization.

128782640138039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599245223416.

The product of its (nonzero) digits is 27869184, while the sum is 62.

The spelling of 128782640138039 in words is "one hundred twenty-eight trillion, seven hundred eighty-two billion, six hundred forty million, one hundred thirty-eight thousand, thirty-nine".