128659281 has 16 divisors (see below), whose sum is σ = 181905984. Its totient is φ = 80607744.

The previous prime is 128659277. The next prime is 128659301. The reversal of 128659281 is 182956821.

It is a happy number.

It is not a de Polignac number, because 128659281 - 2² = 128659277 is a prime.

It is a super-2 number, since 2×128659281² = 33106421174873922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128659211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43605 + ... + 46461.

It is an arithmetic number, because the mean of its divisors is an integer number (11369124).

Almost surely, 2^128659281 is an apocalyptic number.

It is an amenable number.

128659281 is a deficient number, since it is larger than the sum of its proper divisors (53246703).

128659281 is a wasteful number, since it uses less digits than its factorization.

128659281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760.

The product of its digits is 69120, while the sum is 42.

The square root of 128659281 is about 11342.8074567102. The cubic root of 128659281 is about 504.8321907557.

The spelling of 128659281 in words is "one hundred twenty-eight million, six hundred fifty-nine thousand, two hundred eighty-one".