27911138660 has 12 divisors (see below), whose sum is σ = 58613391228. Its totient is φ = 11164455456.

The previous prime is 27911138623. The next prime is 27911138677. The reversal of 27911138660 is 6683111972.

It can be written as a sum of positive squares in 2 ways, for example, as 8585134336 + 19326004324 = 92656^2 + 139018^2 .

It is a super-2 number, since 2×27911138660² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697778447 + ... + 697778486.

It is an arithmetic number, because the mean of its divisors is an integer number (4884449269).

Almost surely, 2^27911138660 is an apocalyptic number.

27911138660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27911138660 is an abundant number, since it is smaller than the sum of its proper divisors (30702252568).

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

27911138660 is a wasteful number, since it uses less digits than its factorization.

27911138660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395556942 (or 1395556940 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 27911138660 in words is "twenty-seven billion, nine hundred eleven million, one hundred thirty-eight thousand, six hundred sixty".