28081645168 has 20 divisors (see below), whose sum is σ = 56284332840. Its totient is φ = 13556656064.

The previous prime is 28081645153. The next prime is 28081645181. The reversal of 28081645168 is 86154618082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30259930 + ... + 30260857.

It is an arithmetic number, because the mean of its divisors is an integer number (2814216642).

Almost surely, 2^28081645168 is an apocalyptic number.

It is an amenable number.

28081645168 is an abundant number, since it is smaller than the sum of its proper divisors (28202687672).

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

28081645168 is a wasteful number, since it uses less digits than its factorization.

28081645168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60520824 (or 60520818 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 28081645168 in words is "twenty-eight billion, eighty-one million, six hundred forty-five thousand, one hundred sixty-eight".