128208272817 has 32 divisors (see below), whose sum is σ = 172822488192. Its totient is φ = 84539879424.

The previous prime is 128208272809. The next prime is 128208272849. The reversal of 128208272817 is 718272802821.

It is not a de Polignac number, because 128208272817 - 2³ = 128208272809 is a prime.

It is a super-2 number, since 2×128208272817² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128208272117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100397383 + ... + 100398659.

It is an arithmetic number, because the mean of its divisors is an integer number (5400702756).

Almost surely, 2^128208272817 is an apocalyptic number.

It is an amenable number.

128208272817 is a deficient number, since it is larger than the sum of its proper divisors (44614215375).

128208272817 is a wasteful number, since it uses less digits than its factorization.

128208272817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337.

The product of its (nonzero) digits is 401408, while the sum is 48.

The spelling of 128208272817 in words is "one hundred twenty-eight billion, two hundred eight million, two hundred seventy-two thousand, eight hundred seventeen".