22643857728 has 84 divisors (see below), whose sum is σ = 64961170560. Its totient is φ = 7541366016.

The previous prime is 22643857697. The next prime is 22643857751. The reversal of 22643857728 is 82775834622.

22643857728 is a `hidden beast` number, since 2 + 2 + 6 + 43 + 8 + 577 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 667153 + ... + 700271.

Almost surely, 2^22643857728 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 22643857728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32480585280).

22643857728 is an abundant number, since it is smaller than the sum of its proper divisors (42317312832).

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

22643857728 is a wasteful number, since it uses less digits than its factorization.

22643857728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34324 (or 34311 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 54.

The spelling of 22643857728 in words is "twenty-two billion, six hundred forty-three million, eight hundred fifty-seven thousand, seven hundred twenty-eight".