28117749708 has 144 divisors (see below), whose sum is σ = 74170736640. Its totient is φ = 8974893312.

The previous prime is 28117749707. The next prime is 28117749721. The reversal of 28117749708 is 80794771182.

28117749708 is a `hidden beast` number, since 2 + 81 + 1 + 77 + 497 + 0 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (28117749707) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17496241 + ... + 17497847.

It is an arithmetic number, because the mean of its divisors is an integer number (515074560).

Almost surely, 2^28117749708 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28117749708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37085368320).

28117749708 is an abundant number, since it is smaller than the sum of its proper divisors (46052986932).

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

28117749708 is a wasteful number, since it uses less digits than its factorization.

28117749708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 28117749708 in words is "twenty-eight billion, one hundred seventeen million, seven hundred forty-nine thousand, seven hundred eight".