128621344824 has 128 divisors (see below), whose sum is σ = 411259968000. Its totient is φ = 36484515072.

The previous prime is 128621344783. The next prime is 128621344843. The reversal of 128621344824 is 428443126821.

128621344824 is a `hidden beast` number, since 1 + 286 + 2 + 1 + 344 + 8 + 24 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 128621344824.

It is a congruent number.

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, 95829 + ... + 516164.

It is an arithmetic number, because the mean of its divisors is an integer number (3212968500).

Almost surely, 2^128621344824 is an apocalyptic number.

128621344824 is a gapful number since it is divisible by the number (14) 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 128621344824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205629984000).

128621344824 is an abundant number, since it is smaller than the sum of its proper divisors (282638623176).

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

128621344824 is a wasteful number, since it uses less digits than its factorization.

128621344824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612154 (or 612144 counting only the distinct ones).

The product of its digits is 589824, while the sum is 45.

The spelling of 128621344824 in words is "one hundred twenty-eight billion, six hundred twenty-one million, three hundred forty-four thousand, eight hundred twenty-four".