28357421568 has 320 divisors, whose sum is σ = 91681751040. Its totient is φ = 7608287232.

The previous prime is 28357421531. The next prime is 28357421581. The reversal of 28357421568 is 86512475382.

It is a self number, because there is not a number n which added to its sum of digits gives 28357421568.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25944030 + ... + 25945122.

It is an arithmetic number, because the mean of its divisors is an integer number (286505472).

Almost surely, 2^28357421568 is an apocalyptic number.

28357421568 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 28357421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45840875520).

28357421568 is an abundant number, since it is smaller than the sum of its proper divisors (63324329472).

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

28357421568 is a wasteful number, since it uses less digits than its factorization.

28357421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1251 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 51.

The spelling of 28357421568 in words is "twenty-eight billion, three hundred fifty-seven million, four hundred twenty-one thousand, five hundred sixty-eight".