128868911 has 8 divisors (see below), whose sum is σ = 129939024. Its totient is φ = 127802880.

The previous prime is 128868907. The next prime is 128868967. The reversal of 128868911 is 119868821.

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

It is a cyclic number.

It is not a de Polignac number, because 128868911 - 2² = 128868907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128868511) 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, 99176 + ... + 100466.

It is an arithmetic number, because the mean of its divisors is an integer number (16242378).

Almost surely, 2^128868911 is an apocalyptic number.

128868911 is a deficient number, since it is larger than the sum of its proper divisors (1070113).

128868911 is a wasteful number, since it uses less digits than its factorization.

128868911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041.

The product of its digits is 55296, while the sum is 44.

The square root of 128868911 is about 11352.0443533313. The cubic root of 128868911 is about 505.1062234479.

The spelling of 128868911 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, nine hundred eleven".