27864663784 has 16 divisors (see below), whose sum is σ = 52256539620. Its totient is φ = 13929586560.

The previous prime is 27864663733. The next prime is 27864663793. The reversal of 27864663784 is 48736646872.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26234280900 + 1630382884 = 161970^2 + 40378^2 .

It is a super-2 number, since 2×27864663784² (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, 299707 + ... + 381514.

Almost surely, 2^27864663784 is an apocalyptic number.

It is an amenable number.

27864663784 is a deficient number, since it is larger than the sum of its proper divisors (24391875836).

27864663784 is a wasteful number, since it uses less digits than its factorization.

27864663784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686340 (or 686336 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 61.

The spelling of 27864663784 in words is "twenty-seven billion, eight hundred sixty-four million, six hundred sixty-three thousand, seven hundred eighty-four".