128455281 has 32 divisors (see below), whose sum is σ = 204554880. Its totient is φ = 79377408.

The previous prime is 128455279. The next prime is 128455291. The reversal of 128455281 is 182554821.

128455281 is a `hidden beast` number, since 1 + 28 + 4 + 552 + 81 = 666.

It is not a de Polignac number, because 128455281 - 2¹ = 128455279 is a prime.

It is a super-2 number, since 2×128455281² = 33001518433577922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128455211) 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, 28665 + ... + 32841.

It is an arithmetic number, because the mean of its divisors is an integer number (6392340).

Almost surely, 2^128455281 is an apocalyptic number.

It is an amenable number.

128455281 is a deficient number, since it is larger than the sum of its proper divisors (76099599).

128455281 is a wasteful number, since it uses less digits than its factorization.

128455281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270 (or 4264 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 128455281 is about 11333.8114065834. The cubic root of 128455281 is about 504.5652317900.

It can be divided in two parts, 1284 and 55281, that added together give a palindrome (56565).

The spelling of 128455281 in words is "one hundred twenty-eight million, four hundred fifty-five thousand, two hundred eighty-one".