27726638864 has 20 divisors (see below), whose sum is σ = 53844441756. Its totient is φ = 13831299072.

The previous prime is 27726638861. The next prime is 27726638873. The reversal of 27726638864 is 46883662772.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3565045264 + 24161593600 = 59708^2 + 155440^2 .

It is not an unprimeable number, because it can be changed into a prime (27726638861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994129 + ... + 2007984.

Almost surely, 2^27726638864 is an apocalyptic number.

It is an amenable number.

27726638864 is a deficient number, since it is larger than the sum of its proper divisors (26117802892).

27726638864 is a wasteful number, since it uses less digits than its factorization.

27726638864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002554 (or 4002548 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 59.

The spelling of 27726638864 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred thirty-eight thousand, eight hundred sixty-four".