28883998728 has 96 divisors (see below), whose sum is σ = 84851457600. Its totient is φ = 8823406464.

The previous prime is 28883998673. The next prime is 28883998757. The reversal of 28883998728 is 82789938882.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19101 + ... + 241107.

It is an arithmetic number, because the mean of its divisors is an integer number (883869350).

Almost surely, 2^28883998728 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 28883998728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42425728800).

28883998728 is an abundant number, since it is smaller than the sum of its proper divisors (55967458872).

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

28883998728 is a wasteful number, since it uses less digits than its factorization.

28883998728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222171 (or 222164 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 72.

The spelling of 28883998728 in words is "twenty-eight billion, eight hundred eighty-three million, nine hundred ninety-eight thousand, seven hundred twenty-eight".