27786968773 has 4 divisors (see below), whose sum is σ = 28745140140. Its totient is φ = 26828797408.

The previous prime is 27786968753. The next prime is 27786968813. The reversal of 27786968773 is 37786968772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12007338084 + 15779630689 = 109578^2 + 125617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27786968773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27786968753) 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, 479085640 + ... + 479085697.

It is an arithmetic number, because the mean of its divisors is an integer number (7186285035).

Almost surely, 2^27786968773 is an apocalyptic number.

It is an amenable number.

27786968773 is a deficient number, since it is larger than the sum of its proper divisors (958171367).

27786968773 is an equidigital number, since it uses as much as digits as its factorization.

27786968773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958171366.

The product of its digits is 298722816, while the sum is 70.

Subtracting 27786968773 from its reverse (37786968772), we obtain a palindrome (9999999999).

The spelling of 27786968773 in words is "twenty-seven billion, seven hundred eighty-six million, nine hundred sixty-eight thousand, seven hundred seventy-three".