128860281 has 24 divisors (see below), whose sum is σ = 209842080. Its totient is φ = 78095160.

The previous prime is 128860267. The next prime is 128860301. The reversal of 128860281 is 182068821.

It is not a de Polignac number, because 128860281 - 2⁶ = 128860217 is a prime.

It is a super-2 number, since 2×128860281² = 33209944038797922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128860231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16455 + ... + 22988.

It is an arithmetic number, because the mean of its divisors is an integer number (8743420).

Almost surely, 2^128860281 is an apocalyptic number.

128860281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128860281 is a deficient number, since it is larger than the sum of its proper divisors (80981799).

128860281 is a wasteful number, since it uses less digits than its factorization.

128860281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39474 (or 39457 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 128860281 is about 11351.6642392206. The cubic root of 128860281 is about 505.0949480002.

The spelling of 128860281 in words is "one hundred twenty-eight million, eight hundred sixty thousand, two hundred eighty-one".