28071945697 has 2 divisors, whose sum is σ = 28071945698. Its totient is φ = 28071945696.

The previous prime is 28071945677. The next prime is 28071945739. The reversal of 28071945697 is 79654917082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15731179776 + 12340765921 = 125424^2 + 111089^2 .

It is a cyclic number.

It is not a de Polignac number, because 28071945697 - 2¹¹ = 28071943649 is a prime.

It is not a weakly prime, because it can be changed into another prime (28071945617) 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, 14035972848 + 14035972849.

It is an arithmetic number, because the mean of its divisors is an integer number (14035972849).

Almost surely, 2^28071945697 is an apocalyptic number.

It is an amenable number.

28071945697 is a deficient number, since it is larger than the sum of its proper divisors (1).

28071945697 is an equidigital number, since it uses as much as digits as its factorization.

28071945697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 28071945697 in words is "twenty-eight billion, seventy-one million, nine hundred forty-five thousand, six hundred ninety-seven".