128747520 has 288 divisors, whose sum is σ = 490613760. Its totient is φ = 30965760.

The previous prime is 128747519. The next prime is 128747527. The reversal of 128747520 is 25747821.

128747520 is a `hidden beast` number, since 12 + 87 + 47 + 520 = 666.

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 (36).

It is not an unprimeable number, because it can be changed into a prime (128747527) 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, 1013697 + ... + 1013823.

It is an arithmetic number, because the mean of its divisors is an integer number (1703520).

Almost surely, 2^128747520 is an apocalyptic number.

128747520 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 128747520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245306880).

128747520 is an abundant number, since it is smaller than the sum of its proper divisors (361866240).

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

128747520 is a wasteful number, since it uses less digits than its factorization.

128747520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 128747520 is about 11346.6964355270. The cubic root of 128747520 is about 504.9475748604.

The spelling of 128747520 in words is "one hundred twenty-eight million, seven hundred forty-seven thousand, five hundred twenty".