28220847768 has 192 divisors, whose sum is σ = 82062489600. Its totient is φ = 9076458240.

The previous prime is 28220847731. The next prime is 28220847793. The reversal of 28220847768 is 86774802282.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34289805 + ... + 34290627.

It is an arithmetic number, because the mean of its divisors is an integer number (427408800).

Almost surely, 2^28220847768 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 28220847768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41031244800).

28220847768 is an abundant number, since it is smaller than the sum of its proper divisors (53841641832).

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

28220847768 is a wasteful number, since it uses less digits than its factorization.

28220847768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 54.

The spelling of 28220847768 in words is "twenty-eight billion, two hundred twenty million, eight hundred forty-seven thousand, seven hundred sixty-eight".