128227281 has 32 divisors (see below), whose sum is σ = 212997120. Its totient is φ = 66809664.

The previous prime is 128227271. The next prime is 128227283. The reversal of 128227281 is 182722821.

It is not a de Polignac number, because 128227281 - 2⁶ = 128227217 is a prime.

It is a super-2 number, since 2×128227281² = 32884471185305922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128227283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19830 + ... + 25488.

It is an arithmetic number, because the mean of its divisors is an integer number (6656160).

Almost surely, 2^128227281 is an apocalyptic number.

It is an amenable number.

128227281 is a deficient number, since it is larger than the sum of its proper divisors (84769839).

128227281 is a wasteful number, since it uses less digits than its factorization.

128227281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5765.

The product of its digits is 7168, while the sum is 33.

The square root of 128227281 is about 11323.7485401257. The cubic root of 128227281 is about 504.2665312031.

The spelling of 128227281 in words is "one hundred twenty-eight million, two hundred twenty-seven thousand, two hundred eighty-one".