28161859728 has 160 divisors (see below), whose sum is σ = 81667630080. Its totient is φ = 8318730240.

The previous prime is 28161859703. The next prime is 28161859769. The reversal of 28161859728 is 82795816182.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 920908 + ... + 950996.

It is an arithmetic number, because the mean of its divisors is an integer number (510422688).

Almost surely, 2^28161859728 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 28161859728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40833815040).

28161859728 is an abundant number, since it is smaller than the sum of its proper divisors (53505770352).

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

28161859728 is a wasteful number, since it uses less digits than its factorization.

28161859728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30185 (or 30179 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 57.

The spelling of 28161859728 in words is "twenty-eight billion, one hundred sixty-one million, eight hundred fifty-nine thousand, seven hundred twenty-eight".