28728374336 has 56 divisors (see below), whose sum is σ = 57794530080. Its totient is φ = 14166577152.

The previous prime is 28728374321. The next prime is 28728374359. The reversal of 28728374336 is 63347382782.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3283760 + ... + 3292496.

It is an arithmetic number, because the mean of its divisors is an integer number (1032045180).

Almost surely, 2^28728374336 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 28728374336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28897265040).

28728374336 is an abundant number, since it is smaller than the sum of its proper divisors (29066155744).

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

28728374336 is an equidigital number, since it uses as much as digits as its factorization.

28728374336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451 (or 9441 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 53.

The spelling of 28728374336 in words is "twenty-eight billion, seven hundred twenty-eight million, three hundred seventy-four thousand, three hundred thirty-six".