128189790450420 has 96 divisors (see below), whose sum is σ = 362209268211840. Its totient is φ = 33871937003520.

The previous prime is 128189790450349. The next prime is 128189790450427. The reversal of 128189790450420 is 24054097981821.

128189790450420 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128189790450427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21564076 + ... + 26858684.

It is an arithmetic number, because the mean of its divisors is an integer number (3773013210540).

Almost surely, 2^{128189790450420} is an apocalyptic number.

128189790450420 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 128189790450420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181104634105920).

128189790450420 is an abundant number, since it is smaller than the sum of its proper divisors (234019477761420).

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

128189790450420 is a wasteful number, since it uses less digits than its factorization.

128189790450420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298305 (or 5298303 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 128189790450420 in words is "one hundred twenty-eight trillion, one hundred eighty-nine billion, seven hundred ninety million, four hundred fifty thousand, four hundred twenty".