27777777677 has 8 divisors (see below), whose sum is σ = 29916231576. Its totient is φ = 25639566912.

The previous prime is 27777777661. The next prime is 27777777679. The reversal of 27777777677 is 77677777772.

It can be written as a sum of positive squares in 4 ways, for example, as 3023790121 + 24753987556 = 54989^2 + 157334^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27777777677 - 2⁴ = 27777777661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27777777677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777777679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227003 + ... + 327239.

It is an arithmetic number, because the mean of its divisors is an integer number (3739528947).

Almost surely, 2^27777777677 is an apocalyptic number.

It is an amenable number.

27777777677 is a deficient number, since it is larger than the sum of its proper divisors (2138453899).

27777777677 is a wasteful number, since it uses less digits than its factorization.

27777777677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121567.

The product of its digits is 484243284, while the sum is 71.

The spelling of 27777777677 in words is "twenty-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred seventy-seven".