128868111 has 16 divisors (see below), whose sum is σ = 191311200. Its totient is φ = 85734144.

The previous prime is 128868107. The next prime is 128868191. The reversal of 128868111 is 111868821.

It is a happy number.

It is not a de Polignac number, because 128868111 - 2² = 128868107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128868101) 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, 9055 + ... + 18431.

It is an arithmetic number, because the mean of its divisors is an integer number (11956950).

Almost surely, 2^128868111 is an apocalyptic number.

128868111 is a deficient number, since it is larger than the sum of its proper divisors (62443089).

128868111 is an equidigital number, since it uses as much as digits as its factorization.

128868111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9895 (or 9889 counting only the distinct ones).

The product of its digits is 6144, while the sum is 36.

The square root of 128868111 is about 11352.0091173325. The cubic root of 128868111 is about 505.1051782364.

The spelling of 128868111 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, one hundred eleven".