28218851568 has 120 divisors (see below), whose sum is σ = 81358136496. Its totient is φ = 9123840000.

The previous prime is 28218851561. The next prime is 28218851569. The reversal of 28218851568 is 86515881282.

28218851568 is a `hidden beast` number, since 2 + 8 + 21 + 8 + 8 + 51 + 568 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218851561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1755568 + ... + 1771568.

Almost surely, 2^28218851568 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 28218851568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40679068248).

28218851568 is an abundant number, since it is smaller than the sum of its proper divisors (53139284928).

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

28218851568 is a wasteful number, since it uses less digits than its factorization.

28218851568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16383 (or 16374 counting only the distinct ones).

The product of its digits is 2457600, while the sum is 54.

The spelling of 28218851568 in words is "twenty-eight billion, two hundred eighteen million, eight hundred fifty-one thousand, five hundred sixty-eight".