128836487844 has 315 divisors, whose sum is σ = 375463437223. Its totient is φ = 38661929856.

The previous prime is 128836487783. The next prime is 128836487849. The reversal of 128836487844 is 448784638821.

The square root of 128836487844 is 358938.

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

128836487844 is a `hidden beast` number, since 1 + 2 + 88 + 36 + 487 + 8 + 44 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39984801444 + 88851686400 = 199962^2 + 298080^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128836487849) by changing a digit.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 5601586417 + ... + 5601586439.

Almost surely, 2^128836487844 is an apocalyptic number.

128836487844 is the 358938-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128836487844

128836487844 is an abundant number, since it is smaller than the sum of its proper divisors (246626949379).

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

128836487844 is an frugal number, since it uses more digits than its factorization.

128836487844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 45 counting only the distinct ones).

The product of its digits is 66060288, while the sum is 63.

The spelling of 128836487844 in words is "one hundred twenty-eight billion, eight hundred thirty-six million, four hundred eighty-seven thousand, eight hundred forty-four".