28081788677 has 2 divisors, whose sum is σ = 28081788678. Its totient is φ = 28081788676.

The previous prime is 28081788673. The next prime is 28081788727. The reversal of 28081788677 is 77688718082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25233004801 + 2848783876 = 158849^2 + 53374^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081788677 - 2² = 28081788673 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28081788673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040894338 + 14040894339.

It is an arithmetic number, because the mean of its divisors is an integer number (14040894339).

Almost surely, 2^28081788677 is an apocalyptic number.

It is an amenable number.

28081788677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081788677 is an equidigital number, since it uses as much as digits as its factorization.

28081788677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16859136, while the sum is 62.

The spelling of 28081788677 in words is "twenty-eight billion, eighty-one million, seven hundred eighty-eight thousand, six hundred seventy-seven".