128710881 has 12 divisors (see below), whose sum is σ = 200217108. Its totient is φ = 79206624.

The previous prime is 128710867. The next prime is 128710943. The reversal of 128710881 is 188017821.

It can be written as a sum of positive squares in 2 ways, for example, as 36723600 + 91987281 = 6060^2 + 9591^2 .

It is not a de Polignac number, because 128710881 - 2¹⁴ = 128694497 is a prime.

It is a super-2 number, since 2×128710881² = 33132981775592322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128710861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549930 + ... + 550163.

It is an arithmetic number, because the mean of its divisors is an integer number (16684759).

Almost surely, 2^128710881 is an apocalyptic number.

It is an amenable number.

128710881 is a deficient number, since it is larger than the sum of its proper divisors (71506227).

128710881 is a wasteful number, since it uses less digits than its factorization.

128710881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100112 (or 1100109 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 128710881 is about 11345.0817978541. The cubic root of 128710881 is about 504.8996709488.

The spelling of 128710881 in words is "one hundred twenty-eight million, seven hundred ten thousand, eight hundred eighty-one".