28317148728 has 128 divisors (see below), whose sum is σ = 79535520000. Its totient is φ = 8325918720.

The previous prime is 28317148711. The next prime is 28317148753. The reversal of 28317148728 is 82784171382.

It is a Cunningham number, because it is equal to 168277²-1.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3698248 + ... + 3705896.

It is an arithmetic number, because the mean of its divisors is an integer number (621371250).

Almost surely, 2^28317148728 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 28317148728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39767760000).

28317148728 is an abundant number, since it is smaller than the sum of its proper divisors (51218371272).

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

28317148728 is a wasteful number, since it uses less digits than its factorization.

28317148728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8085 (or 8081 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 51.

The spelling of 28317148728 in words is "twenty-eight billion, three hundred seventeen million, one hundred forty-eight thousand, seven hundred twenty-eight".