128528784 has 120 divisors (see below), whose sum is σ = 379297152. Its totient is φ = 40550400.

The previous prime is 128528779. The next prime is 128528791. The reversal of 128528784 is 487825821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 499984 + ... + 500240.

Almost surely, 2^128528784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128528784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189648576).

128528784 is an abundant number, since it is smaller than the sum of its proper divisors (250768368).

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

128528784 is a wasteful number, since it uses less digits than its factorization.

128528784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 436 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 128528784 is about 11337.0535854780. The cubic root of 128528784 is about 504.6614520112.

The spelling of 128528784 in words is "one hundred twenty-eight million, five hundred twenty-eight thousand, seven hundred eighty-four".