28011475813 has 2 divisors, whose sum is σ = 28011475814. Its totient is φ = 28011475812.

The previous prime is 28011475769. The next prime is 28011475823. The reversal of 28011475813 is 31857411082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25897499329 + 2113976484 = 160927^2 + 45978^2 .

It is a cyclic number.

It is not a de Polignac number, because 28011475813 - 2³³ = 19421541221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28011475823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005737906 + 14005737907.

It is an arithmetic number, because the mean of its divisors is an integer number (14005737907).

Almost surely, 2^28011475813 is an apocalyptic number.

It is an amenable number.

28011475813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28011475813 is an equidigital number, since it uses as much as digits as its factorization.

28011475813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 40.

Adding to 28011475813 its reverse (31857411082), we get a palindrome (59868886895).

The spelling of 28011475813 in words is "twenty-eight billion, eleven million, four hundred seventy-five thousand, eight hundred thirteen".