128381018220 has 432 divisors, whose sum is σ = 494058015360. Its totient is φ = 26742223872.

The previous prime is 128381018197. The next prime is 128381018221. The reversal of 128381018220 is 22810183821.

128381018220 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (128381018221) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9051054 + ... + 9065226.

Almost surely, 2^128381018220 is an apocalyptic number.

128381018220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128381018220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247029007680).

128381018220 is an abundant number, since it is smaller than the sum of its proper divisors (365676997140).

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

128381018220 is a wasteful number, since it uses less digits than its factorization.

128381018220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14294 (or 14282 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 128381018220 in words is "one hundred twenty-eight billion, three hundred eighty-one million, eighteen thousand, two hundred twenty".