27938532218 has 4 divisors (see below), whose sum is σ = 41907798330. Its totient is φ = 13969266108.

The previous prime is 27938532217. The next prime is 27938532229. The reversal of 27938532218 is 81223583972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25355148289 + 2583383929 = 159233^2 + 50827^2 .

It is not an unprimeable number, because it can be changed into a prime (27938532217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6984633053 + ... + 6984633056.

Almost surely, 2^27938532218 is an apocalyptic number.

27938532218 is a deficient number, since it is larger than the sum of its proper divisors (13969266112).

27938532218 is a wasteful number, since it uses less digits than its factorization.

27938532218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13969266111.

The product of its digits is 1451520, while the sum is 50.

The spelling of 27938532218 in words is "twenty-seven billion, nine hundred thirty-eight million, five hundred thirty-two thousand, two hundred eighteen".