128684017 has 16 divisors (see below), whose sum is σ = 168883200. Its totient is φ = 94994640.

The previous prime is 128684009. The next prime is 128684029. The reversal of 128684017 is 710486821.

It is a cyclic number.

It is not a de Polignac number, because 128684017 - 2³ = 128684009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128684077) 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, 42517 + ... + 45442.

It is an arithmetic number, because the mean of its divisors is an integer number (10555200).

Almost surely, 2^128684017 is an apocalyptic number.

It is an amenable number.

128684017 is a deficient number, since it is larger than the sum of its proper divisors (40199183).

128684017 is a wasteful number, since it uses less digits than its factorization.

128684017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87996.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 128684017 is about 11343.8977869161. The cubic root of 128684017 is about 504.8645416512.

The spelling of 128684017 in words is "one hundred twenty-eight million, six hundred eighty-four thousand, seventeen".