128902538879 has 4 divisors (see below), whose sum is σ = 136485041184. Its totient is φ = 121320036576.

The previous prime is 128902538851. The next prime is 128902538881. The reversal of 128902538879 is 978835209821.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128902538879 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 (128902532879) 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 3 ways as a sum of consecutive naturals, for example, 3791251127 + ... + 3791251160.

It is an arithmetic number, because the mean of its divisors is an integer number (34121260296).

Almost surely, 2^128902538879 is an apocalyptic number.

128902538879 is a deficient number, since it is larger than the sum of its proper divisors (7582502305).

128902538879 is an equidigital number, since it uses as much as digits as its factorization.

128902538879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7582502304.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 128902538879 in words is "one hundred twenty-eight billion, nine hundred two million, five hundred thirty-eight thousand, eight hundred seventy-nine".