27665404338 has 128 divisors (see below), whose sum is σ = 67799015424. Its totient is φ = 7411046400.

The previous prime is 27665404337. The next prime is 27665404343. The reversal of 27665404338 is 83340456672.

It is not an unprimeable number, because it can be changed into a prime (27665404337) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2574645 + ... + 2585367.

It is an arithmetic number, because the mean of its divisors is an integer number (529679808).

Almost surely, 2^27665404338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27665404338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33899507712).

27665404338 is an abundant number, since it is smaller than the sum of its proper divisors (40133611086).

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

27665404338 is a wasteful number, since it uses less digits than its factorization.

27665404338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10880.

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 27665404338 in words is "twenty-seven billion, six hundred sixty-five million, four hundred four thousand, three hundred thirty-eight".