128868912 has 30 divisors (see below), whose sum is σ = 360654372. Its totient is φ = 42956256.

The previous prime is 128868907. The next prime is 128868967. The reversal of 128868912 is 219868821.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 447318 + ... + 447605.

Almost surely, 2^128868912 is an apocalyptic number.

128868912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128868912 is an abundant number, since it is smaller than the sum of its proper divisors (231785460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128868912 is a wasteful number, since it uses less digits than its factorization.

128868912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894937 (or 894928 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 128868912 is about 11352.0443973762. The cubic root of 128868912 is about 505.1062247544.

Subtracting 128868912 from its reverse (219868821), we obtain a palindrome (90999909).

The spelling of 128868912 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, nine hundred twelve".