27819387664 has 20 divisors (see below), whose sum is σ = 54243381004. Its totient is φ = 13821095808.

The previous prime is 27819387653. The next prime is 27819387679. The reversal of 27819387664 is 46678391872.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20643942400 + 7175445264 = 143680^2 + 84708^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534787 + ... + 5539810.

Almost surely, 2^27819387664 is an apocalyptic number.

It is an amenable number.

27819387664 is a deficient number, since it is larger than the sum of its proper divisors (26423993340).

27819387664 is a wasteful number, since it uses less digits than its factorization.

27819387664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11074762 (or 11074756 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The spelling of 27819387664 in words is "twenty-seven billion, eight hundred nineteen million, three hundred eighty-seven thousand, six hundred sixty-four".