27768936749 has 4 divisors (see below), whose sum is σ = 28103502336. Its totient is φ = 27434371164.

The previous prime is 27768936721. The next prime is 27768936751. The reversal of 27768936749 is 94763986772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27768936749 - 2⁸ = 27768936493 is a prime.

It is a super-2 number, since 2×27768936749² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27768936779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167282669 + ... + 167282834.

It is an arithmetic number, because the mean of its divisors is an integer number (7025875584).

Almost surely, 2^27768936749 is an apocalyptic number.

It is an amenable number.

27768936749 is a deficient number, since it is larger than the sum of its proper divisors (334565587).

27768936749 is an equidigital number, since it uses as much as digits as its factorization.

27768936749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334565586.

The product of its digits is 192036096, while the sum is 68.

The spelling of 27768936749 in words is "twenty-seven billion, seven hundred sixty-eight million, nine hundred thirty-six thousand, seven hundred forty-nine".