128113920 has 288 divisors, whose sum is σ = 497427840. Its totient is φ = 30965760.

The previous prime is 128113919. The next prime is 128113927. The reversal of 128113920 is 29311821.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128113927) 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, 379992 + ... + 380328.

It is an arithmetic number, because the mean of its divisors is an integer number (1727180).

Almost surely, 2^128113920 is an apocalyptic number.

128113920 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 128113920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248713920).

128113920 is an abundant number, since it is smaller than the sum of its proper divisors (369313920).

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

128113920 is a wasteful number, since it uses less digits than its factorization.

128113920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 128113920 is about 11318.7419795665. The cubic root of 128113920 is about 504.1178862563.

The spelling of 128113920 in words is "one hundred twenty-eight million, one hundred thirteen thousand, nine hundred twenty".