27720068769 has 12 divisors (see below), whose sum is σ = 40044561492. Its totient is φ = 18477986400.

The previous prime is 27720068767. The next prime is 27720068797. The reversal of 27720068769 is 96786002772.

It can be written as a sum of positive squares in 2 ways, for example, as 18035147025 + 9684921744 = 134295^2 + 98412^2 .

It is not a de Polignac number, because 27720068769 - 2¹ = 27720068767 is a prime.

It is a super-2 number, since 2×27720068769² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27720068767) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 84022 + ... + 249999.

It is an arithmetic number, because the mean of its divisors is an integer number (3337046791).

Almost surely, 2^27720068769 is an apocalyptic number.

It is an amenable number.

27720068769 is a deficient number, since it is larger than the sum of its proper divisors (12324492723).

27720068769 is a wasteful number, since it uses less digits than its factorization.

27720068769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343248 (or 343245 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 27720068769 in words is "twenty-seven billion, seven hundred twenty million, sixty-eight thousand, seven hundred sixty-nine".