28318655808 has 56 divisors (see below), whose sum is σ = 83251608960. Its totient is φ = 9439551360.

The previous prime is 28318655801. The next prime is 28318655809. The reversal of 28318655808 is 80855681382.

It is a happy number.

28318655808 is a `hidden beast` number, since 2 + 8 + 3 + 1 + 86 + 558 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28318655801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8192328 + ... + 8195783.

Almost surely, 2^28318655808 is an apocalyptic number.

It is an amenable number.

28318655808 is an abundant number, since it is smaller than the sum of its proper divisors (54932953152).

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

28318655808 is a wasteful number, since it uses less digits than its factorization.

28318655808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16388132 (or 16388116 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 54.

The spelling of 28318655808 in words is "twenty-eight billion, three hundred eighteen million, six hundred fifty-five thousand, eight hundred eight".