28648897792 has 72 divisors (see below), whose sum is σ = 58204024200. Its totient is φ = 14071529472.

The previous prime is 28648897757. The next prime is 28648897807. The reversal of 28648897792 is 29779884682.

It can be written as a sum of positive squares in 4 ways, for example, as 1071645696 + 27577252096 = 32736^2 + 166064^2 .

It is a congruent 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, 3573084 + ... + 3581092.

It is an arithmetic number, because the mean of its divisors is an integer number (808389225).

Almost surely, 2^28648897792 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 28648897792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29102012100).

28648897792 is an abundant number, since it is smaller than the sum of its proper divisors (29555126408).

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

28648897792 is an equidigital number, since it uses as much as digits as its factorization.

28648897792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271 (or 8257 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 70.

The spelling of 28648897792 in words is "twenty-eight billion, six hundred forty-eight million, eight hundred ninety-seven thousand, seven hundred ninety-two".