28120369728 has 112 divisors (see below), whose sum is σ = 81268580160. Its totient is φ = 8510515200.

The previous prime is 28120369703. The next prime is 28120369729. The reversal of 28120369728 is 82796302182.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (28120369729) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1742818 + ... + 1758878.

Almost surely, 2^28120369728 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 28120369728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40634290080).

28120369728 is an abundant number, since it is smaller than the sum of its proper divisors (53148210432).

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

28120369728 is a wasteful number, since it uses less digits than its factorization.

28120369728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16916 (or 16906 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 28120369728 in words is "twenty-eight billion, one hundred twenty million, three hundred sixty-nine thousand, seven hundred twenty-eight".