128489537280 has 432 divisors, whose sum is σ = 448144220160. Its totient is φ = 31359025152.

The previous prime is 128489537269. The next prime is 128489537291. The reversal of 128489537280 is 82735984821.

It is an interprime number because it is at equal distance from previous prime (128489537269) and next prime (128489537291).

It is a super-2 number, since 2×128489537280² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128489537280.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 82417141 + ... + 82418699.

It is an arithmetic number, because the mean of its divisors is an integer number (1037370880).

Almost surely, 2^128489537280 is an apocalyptic number.

128489537280 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 128489537280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224072110080).

128489537280 is an abundant number, since it is smaller than the sum of its proper divisors (319654682880).

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

128489537280 is a wasteful number, since it uses less digits than its factorization.

128489537280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 128489537280 in words is "one hundred twenty-eight billion, four hundred eighty-nine million, five hundred thirty-seven thousand, two hundred eighty".