27764720369 has 4 divisors (see below), whose sum is σ = 27770596260. Its totient is φ = 27758844480.

The previous prime is 27764720359. The next prime is 27764720383. The reversal of 27764720369 is 96302746772.

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 14277382144 + 13487338225 = 119488^2 + 116135^2 .

It is a cyclic number.

It is not a de Polignac number, because 27764720369 - 2²⁸ = 27496284913 is a prime.

It is a super-2 number, since 2×27764720369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27764720369.

It is not an unprimeable number, because it can be changed into a prime (27764720359) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2930852 + ... + 2940309.

It is an arithmetic number, because the mean of its divisors is an integer number (6942649065).

Almost surely, 2^27764720369 is an apocalyptic number.

It is an amenable number.

27764720369 is a deficient number, since it is larger than the sum of its proper divisors (5875891).

27764720369 is an equidigital number, since it uses as much as digits as its factorization.

27764720369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5875890.

The product of its (nonzero) digits is 5334336, while the sum is 53.

The spelling of 27764720369 in words is "twenty-seven billion, seven hundred sixty-four million, seven hundred twenty thousand, three hundred sixty-nine".