28228305618 has 30 divisors (see below), whose sum is σ = 61470224439. Its totient is φ = 9362151612.

The previous prime is 28228305617. The next prime is 28228305661. The reversal of 28228305618 is 81650382282.

28228305618 is a `hidden beast` number, since 2 + 8 + 2 + 2 + 83 + 0 + 561 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14114152809 + 14114152809 = 118803^2 + 118803^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118803.

It is not an unprimeable number, because it can be changed into a prime (28228305617) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 141850683 + ... + 141850881.

Almost surely, 2^28228305618 is an apocalyptic number.

28228305618 is an abundant number, since it is smaller than the sum of its proper divisors (33241918821).

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

28228305618 is an frugal number, since it uses more digits than its factorization.

28228305618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28228305618 in words is "twenty-eight billion, two hundred twenty-eight million, three hundred five thousand, six hundred eighteen".