28821724568 has 128 divisors (see below), whose sum is σ = 71162112000. Its totient is φ = 10624504320.

The previous prime is 28821724553. The next prime is 28821724577. The reversal of 28821724568 is 86542712882.

It is a happy number.

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, 826673 + ... + 860831.

It is an arithmetic number, because the mean of its divisors is an integer number (555954000).

Almost surely, 2^28821724568 is an apocalyptic number.

28821724568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28821724568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35581056000).

28821724568 is an abundant number, since it is smaller than the sum of its proper divisors (42340387432).

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

28821724568 is a wasteful number, since it uses less digits than its factorization.

28821724568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34265 (or 34261 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 53.

The spelling of 28821724568 in words is "twenty-eight billion, eight hundred twenty-one million, seven hundred twenty-four thousand, five hundred sixty-eight".