128791520 has 144 divisors (see below), whose sum is σ = 360258192. Its totient is φ = 43130880.

The previous prime is 128791499. The next prime is 128791529. The reversal of 128791520 is 25197821.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128791529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297224 + ... + 297656.

It is an arithmetic number, because the mean of its divisors is an integer number (2501793).

Almost surely, 2^128791520 is an apocalyptic number.

128791520 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 128791520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180129096).

128791520 is an abundant number, since it is smaller than the sum of its proper divisors (231466672).

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

128791520 is a wasteful number, since it uses less digits than its factorization.

128791520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 128791520 is about 11348.6351602296. The cubic root of 128791520 is about 505.0050909528.

The spelling of 128791520 in words is "one hundred twenty-eight million, seven hundred ninety-one thousand, five hundred twenty".