128887809411 has 4 divisors (see below), whose sum is σ = 171850412552. Its totient is φ = 85925206272.

The previous prime is 128887809373. The next prime is 128887809419. The reversal of 128887809411 is 114908788821.

It is a happy number.

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

It is not a de Polignac number, because 128887809411 - 2¹⁵ = 128887776643 is a prime.

It is a super-2 number, since 2×128887809411² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128887809419) 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, 21481301566 + ... + 21481301571.

It is an arithmetic number, because the mean of its divisors is an integer number (42962603138).

Almost surely, 2^128887809411 is an apocalyptic number.

128887809411 is a deficient number, since it is larger than the sum of its proper divisors (42962603141).

128887809411 is an equidigital number, since it uses as much as digits as its factorization.

128887809411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42962603140.

The product of its (nonzero) digits is 2064384, while the sum is 57.

The spelling of 128887809411 in words is "one hundred twenty-eight billion, eight hundred eighty-seven million, eight hundred nine thousand, four hundred eleven".