128941081920 has 336 divisors, whose sum is σ = 514431735168. Its totient is φ = 29032058880.

The previous prime is 128941081903. The next prime is 128941081963. The reversal of 128941081920 is 29180149821.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1302990 + ... + 1398450.

Almost surely, 2^128941081920 is an apocalyptic number.

128941081920 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 128941081920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257215867584).

128941081920 is an abundant number, since it is smaller than the sum of its proper divisors (385490653248).

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

128941081920 is a wasteful number, since it uses less digits than its factorization.

128941081920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95558 (or 95545 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 128941081920 in words is "one hundred twenty-eight billion, nine hundred forty-one million, eighty-one thousand, nine hundred twenty".