28719649697 has 2 divisors, whose sum is σ = 28719649698. Its totient is φ = 28719649696.

The previous prime is 28719649691. The next prime is 28719649789. The reversal of 28719649697 is 79694691782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22382852881 + 6336796816 = 149609^2 + 79604^2 .

It is a cyclic number.

It is not a de Polignac number, because 28719649697 - 2⁴ = 28719649681 is a prime.

It is not a weakly prime, because it can be changed into another prime (28719649691) 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 as a sum of consecutive naturals, namely, 14359824848 + 14359824849.

It is an arithmetic number, because the mean of its divisors is an integer number (14359824849).

Almost surely, 2^28719649697 is an apocalyptic number.

It is an amenable number.

28719649697 is a deficient number, since it is larger than the sum of its proper divisors (1).

28719649697 is an equidigital number, since it uses as much as digits as its factorization.

28719649697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82301184, while the sum is 68.

The spelling of 28719649697 in words is "twenty-eight billion, seven hundred nineteen million, six hundred forty-nine thousand, six hundred ninety-seven".