128818439424 has 180 divisors, whose sum is σ = 385819504224. Its totient is φ = 42748756992.

The previous prime is 128818439417. The next prime is 128818439507. The reversal of 128818439424 is 424934818821.

128818439424 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 184 + 39 + 424 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

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 19 ways as a sum of consecutive naturals, for example, 4693389 + ... + 4720755.

Almost surely, 2^128818439424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128818439424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192909752112).

128818439424 is an abundant number, since it is smaller than the sum of its proper divisors (257001064800).

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

128818439424 is an equidigital number, since it uses as much as digits as its factorization.

128818439424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27622 (or 27599 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 54.

The spelling of 128818439424 in words is "one hundred twenty-eight billion, eight hundred eighteen million, four hundred thirty-nine thousand, four hundred twenty-four".