128187886338 has 72 divisors (see below), whose sum is σ = 288614486160. Its totient is φ = 42698725560.

The previous prime is 128187886331. The next prime is 128187886357. The reversal of 128187886338 is 833688781821.

It is not an unprimeable number, because it can be changed into a prime (128187886331) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25336053 + ... + 25341111.

It is an arithmetic number, because the mean of its divisors is an integer number (4008534530).

Almost surely, 2^128187886338 is an apocalyptic number.

128187886338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128187886338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144307243080).

128187886338 is an abundant number, since it is smaller than the sum of its proper divisors (160426599822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128187886338 is an frugal number, since it uses more digits than its factorization.

128187886338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7016 (or 6995 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 63.

The spelling of 128187886338 in words is "one hundred twenty-eight billion, one hundred eighty-seven million, eight hundred eighty-six thousand, three hundred thirty-eight".