28128688168 has 32 divisors (see below), whose sum is σ = 63448171200. Its totient is φ = 11420669952.

The previous prime is 28128688141. The next prime is 28128688171. The reversal of 28128688168 is 86188682182.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13217305 + ... + 13219432.

It is an arithmetic number, because the mean of its divisors is an integer number (1982755350).

Almost surely, 2^28128688168 is an apocalyptic number.

28128688168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28128688168 is an abundant number, since it is smaller than the sum of its proper divisors (35319483032).

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

28128688168 is a wasteful number, since it uses less digits than its factorization.

28128688168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26436769 (or 26436765 counting only the distinct ones).

The product of its digits is 4718592, while the sum is 58.

The spelling of 28128688168 in words is "twenty-eight billion, one hundred twenty-eight million, six hundred eighty-eight thousand, one hundred sixty-eight".