128251366884 has 81 divisors (see below), whose sum is σ = 344480894121. Its totient is φ = 40224263040.

The previous prime is 128251366849. The next prime is 128251366909. The reversal of 128251366884 is 488663152821.

The square root of 128251366884 is 358122.

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

128251366884 is a `hidden beast` number, since 1 + 28 + 251 + 366 + 8 + 8 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 99849680100 + 28401686784 = 315990^2 + 168528^2 .

It is a super-2 number, since 2×128251366884² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128251366884.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 36526689 + ... + 36530199.

Almost surely, 2^128251366884 is an apocalyptic number.

128251366884 is the 358122-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128251366884

128251366884 is an abundant number, since it is smaller than the sum of its proper divisors (216229527237).

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

128251366884 is an equidigital number, since it uses as much as digits as its factorization.

128251366884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066 (or 3533 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The spelling of 128251366884 in words is "one hundred twenty-eight billion, two hundred fifty-one million, three hundred sixty-six thousand, eight hundred eighty-four".