28338565638 has 16 divisors (see below), whose sum is σ = 56679056640. Its totient is φ = 9445867656.

The previous prime is 28338565637. The next prime is 28338565643. The reversal of 28338565638 is 83656583382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28338565631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172231 + ... + 293837.

It is an arithmetic number, because the mean of its divisors is an integer number (3542441040).

Almost surely, 2^28338565638 is an apocalyptic number.

28338565638 is an abundant number, since it is smaller than the sum of its proper divisors (28340491002).

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

28338565638 is a wasteful number, since it uses less digits than its factorization.

28338565638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160451.

The product of its digits is 24883200, while the sum is 57.

The spelling of 28338565638 in words is "twenty-eight billion, three hundred thirty-eight million, five hundred sixty-five thousand, six hundred thirty-eight".