128544720 has 80 divisors (see below), whose sum is σ = 402509952. Its totient is φ = 33932800.

The previous prime is 128544707. The next prime is 128544749. The reversal of 128544720 is 27445821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21589 + ... + 26891.

Almost surely, 2^128544720 is an apocalyptic number.

128544720 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 128544720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201254976).

128544720 is an abundant number, since it is smaller than the sum of its proper divisors (273965232).

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

128544720 is a wasteful number, since it uses less digits than its factorization.

128544720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420 (or 5414 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 128544720 is about 11337.7563918087. The cubic root of 128544720 is about 504.6823084354.

The spelling of 128544720 in words is "one hundred twenty-eight million, five hundred forty-four thousand, seven hundred twenty".