128139027072 has 256 divisors, whose sum is σ = 395880376320. Its totient is φ = 35968757760.

The previous prime is 128139027067. The next prime is 128139027097. The reversal of 128139027072 is 270720931821.

It is a super-2 number, since 2×128139027072² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36267418 + ... + 36270950.

It is an arithmetic number, because the mean of its divisors is an integer number (1546407720).

Almost surely, 2^128139027072 is an apocalyptic number.

128139027072 is a gapful number since it is divisible by the number (12) 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 128139027072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197940188160).

128139027072 is an abundant number, since it is smaller than the sum of its proper divisors (267741349248).

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

128139027072 is a wasteful number, since it uses less digits than its factorization.

128139027072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791 (or 3779 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

Adding to 128139027072 its reverse (270720931821), we get a palindrome (398859958893).

The spelling of 128139027072 in words is "one hundred twenty-eight billion, one hundred thirty-nine million, twenty-seven thousand, seventy-two".