128284881 has 4 divisors (see below), whose sum is σ = 171046512. Its totient is φ = 85523252.

The previous prime is 128284879. The next prime is 128284909. The reversal of 128284881 is 188482821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128284881 - 2¹ = 128284879 is a prime.

It is a super-3 number, since 3×128284881³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (128284801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21380811 + ... + 21380816.

It is an arithmetic number, because the mean of its divisors is an integer number (42761628).

Almost surely, 2^128284881 is an apocalyptic number.

It is an amenable number.

128284881 is a deficient number, since it is larger than the sum of its proper divisors (42761631).

128284881 is an equidigital number, since it uses as much as digits as its factorization.

128284881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42761630.

The product of its digits is 65536, while the sum is 42.

The square root of 128284881 is about 11326.2915819786. The cubic root of 128284881 is about 504.3420258090.

The spelling of 128284881 in words is "one hundred twenty-eight million, two hundred eighty-four thousand, eight hundred eighty-one".