27728777111 has 32 divisors (see below), whose sum is σ = 33030156288. Its totient is φ = 22778392320.

The previous prime is 27728777101. The next prime is 27728777171. The reversal of 27728777111 is 11177782772.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27728777111 - 2¹⁸ = 27728514967 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 27728777111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728777101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11211371 + ... + 11213843.

It is an arithmetic number, because the mean of its divisors is an integer number (1032192384).

Almost surely, 2^27728777111 is an apocalyptic number.

27728777111 is a deficient number, since it is larger than the sum of its proper divisors (5301379177).

27728777111 is a wasteful number, since it uses less digits than its factorization.

27728777111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991.

The product of its digits is 537824, while the sum is 50.

The spelling of 27728777111 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred seventy-seven thousand, one hundred eleven".