128908911 has 8 divisors (see below), whose sum is σ = 171982384. Its totient is φ = 85887360.

The previous prime is 128908873. The next prime is 128908919. The reversal of 128908911 is 119809821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128908911 - 2⁷ = 128908783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128908911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128908919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6760 + ... + 17421.

It is an arithmetic number, because the mean of its divisors is an integer number (21497798).

Almost surely, 2^128908911 is an apocalyptic number.

128908911 is a deficient number, since it is larger than the sum of its proper divisors (43073473).

128908911 is a wasteful number, since it uses less digits than its factorization.

128908911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25961.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 128908911 is about 11353.8060138440. The cubic root of 128908911 is about 505.1584785101.

The spelling of 128908911 in words is "one hundred twenty-eight million, nine hundred eight thousand, nine hundred eleven".