128220364800 has 1536 divisors, whose sum is σ = 561692620800. Its totient is φ = 28311552000.

The previous prime is 128220364771. The next prime is 128220364837. The reversal of 128220364800 is 8463022821.

128220364800 is a `hidden beast` number, since 1 + 2 + 8 + 2 + 2 + 0 + 3 + 648 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1536).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4136140785 + ... + 4136140815.

It is an arithmetic number, because the mean of its divisors is an integer number (365685300).

Almost surely, 2^128220364800 is an apocalyptic number.

128220364800 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 128220364800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280846310400).

128220364800 is an abundant number, since it is smaller than the sum of its proper divisors (433472256000).

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

128220364800 is a wasteful number, since it uses less digits than its factorization.

128220364800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 128220364800 in words is "one hundred twenty-eight billion, two hundred twenty million, three hundred sixty-four thousand, eight hundred".