28638186912 has 72 divisors (see below), whose sum is σ = 81473107716. Its totient is φ = 9542163456.

The previous prime is 28638186881. The next prime is 28638186989. The reversal of 28638186912 is 21968183682.

It can be written as a sum of positive squares in 2 ways, for example, as 19253227536 + 9384959376 = 138756^2 + 96876^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 734698 + ... + 772694.

Almost surely, 2^28638186912 is an apocalyptic number.

It is an amenable number.

28638186912 is an abundant number, since it is smaller than the sum of its proper divisors (52834920804).

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

28638186912 is a wasteful number, since it uses less digits than its factorization.

28638186912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40630 (or 40619 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 28638186912 in words is "twenty-eight billion, six hundred thirty-eight million, one hundred eighty-six thousand, nine hundred twelve".