128638430244 has 135 divisors (see below), whose sum is σ = 342984766033. Its totient is φ = 40652185728.

The previous prime is 128638430237. The next prime is 128638430299. The reversal of 128638430244 is 442034836821.

It is a happy number.

The square root of 128638430244 is 358662.

It is a perfect power (a square), and thus also a powerful number.

128638430244 is a `hidden beast` number, since 1 + 2 + 8 + 638 + 4 + 3 + 0 + 2 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2266712100 + 126371718144 = 47610^2 + 355488^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128638430244.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1138393132 + ... + 1138393244.

Almost surely, 2^128638430244 is an apocalyptic number.

128638430244 is the 358662-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128638430244

128638430244 is an abundant number, since it is smaller than the sum of its proper divisors (214346335789).

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

128638430244 is an frugal number, since it uses more digits than its factorization.

128638430244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 45.

The spelling of 128638430244 in words is "one hundred twenty-eight billion, six hundred thirty-eight million, four hundred thirty thousand, two hundred forty-four".