27777777777 has 12 divisors (see below), whose sum is σ = 40325084800. Its totient is φ = 18425459448.

The previous prime is 27777777773. The next prime is 27777777791. The reversal of 27777777777 is 77777777772.

It is not a de Polignac number, because 27777777777 - 2² = 27777777773 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (27777777773) 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, 7753033 + ... + 7756614.

Almost surely, 2^27777777777 is an apocalyptic number.

It is an amenable number.

27777777777 is a deficient number, since it is larger than the sum of its proper divisors (12547307023).

27777777777 is a wasteful number, since it uses less digits than its factorization.

27777777777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15509852 (or 15509849 counting only the distinct ones).

The product of its digits is 564950498, while the sum is 72.

The spelling of 27777777777 in words is "twenty-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-seven".