128630784 has 60 divisors (see below), whose sum is σ = 343136024. Its totient is φ = 42860544.

The previous prime is 128630783. The next prime is 128630849. The reversal of 128630784 is 487036821.

It is not an unprimeable number, because it can be changed into a prime (128630783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47844 + ... + 50460.

Almost surely, 2^128630784 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 128630784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171568012).

128630784 is an abundant number, since it is smaller than the sum of its proper divisors (214505240).

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

128630784 is an frugal number, since it uses more digits than its factorization.

128630784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648 (or 2622 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 128630784 is about 11341.5512166546. The cubic root of 128630784 is about 504.7949159083.

The spelling of 128630784 in words is "one hundred twenty-eight million, six hundred thirty thousand, seven hundred eighty-four".