27728746618 has 4 divisors (see below), whose sum is σ = 41593119930. Its totient is φ = 13864373308.

The previous prime is 27728746589. The next prime is 27728746657. The reversal of 27728746618 is 81664782772.

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., 24734796529 + 2993950089 = 157273^2 + 54717^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6932186653 + ... + 6932186656.

Almost surely, 2^27728746618 is an apocalyptic number.

27728746618 is a deficient number, since it is larger than the sum of its proper divisors (13864373312).

27728746618 is a wasteful number, since it uses less digits than its factorization.

27728746618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13864373311.

The product of its digits is 12644352, while the sum is 58.

The spelling of 27728746618 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-six thousand, six hundred eighteen".