128284819281 has 14 divisors (see below), whose sum is σ = 192339243170. Its totient is φ = 85523212368.

The previous prime is 128284819277. The next prime is 128284819283. The reversal of 128284819281 is 182918482821.

It is a happy number.

128284819281 is a `hidden beast` number, since 1 + 2 + 8 + 284 + 81 + 9 + 281 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78727381056 + 49557438225 = 280584^2 + 222615^2 .

It is not a de Polignac number, because 128284819281 - 2² = 128284819277 is a prime.

It is a super-3 number, since 3×128284819281³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128284819283) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 87986116 + ... + 87987573.

Almost surely, 2^128284819281 is an apocalyptic number.

It is an amenable number.

128284819281 is a deficient number, since it is larger than the sum of its proper divisors (64054423889).

128284819281 is an frugal number, since it uses more digits than its factorization.

128284819281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175973707 (or 175973692 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 54.

The spelling of 128284819281 in words is "one hundred twenty-eight billion, two hundred eighty-four million, eight hundred nineteen thousand, two hundred eighty-one".