28791355648 has 108 divisors (see below), whose sum is σ = 65209682944. Its totient is φ = 12664396800.

The previous prime is 28791355631. The next prime is 28791355687. The reversal of 28791355648 is 84655319782.

It is a junction number, because it is equal to n+sod(n) for n = 28791355592 and 28791355601.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 945265 + ... + 975247.

Almost surely, 2^28791355648 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 28791355648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32604841472).

28791355648 is an abundant number, since it is smaller than the sum of its proper divisors (36418327296).

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

28791355648 is a wasteful number, since it uses less digits than its factorization.

28791355648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30052 (or 30027 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 58.

The spelling of 28791355648 in words is "twenty-eight billion, seven hundred ninety-one million, three hundred fifty-five thousand, six hundred forty-eight".