27189638244 has 72 divisors (see below), whose sum is σ = 69645663360. Its totient is φ = 8942536512.

The previous prime is 27189638243. The next prime is 27189638369. The reversal of 27189638244 is 44283698172.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (27189638243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6928867 + ... + 6932789.

It is an arithmetic number, because the mean of its divisors is an integer number (967300880).

Almost surely, 2^27189638244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27189638244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34822831680).

27189638244 is an abundant number, since it is smaller than the sum of its proper divisors (42456025116).

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

27189638244 is a wasteful number, since it uses less digits than its factorization.

27189638244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6449 (or 6444 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 27189638244 in words is "twenty-seven billion, one hundred eighty-nine million, six hundred thirty-eight thousand, two hundred forty-four".