28508639893 has 2 divisors, whose sum is σ = 28508639894. Its totient is φ = 28508639892.

The previous prime is 28508639891. The next prime is 28508639911. The reversal of 28508639893 is 39893680582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21861988164 + 6646651729 = 147858^2 + 81527^2 .

It is a cyclic number.

It is not a de Polignac number, because 28508639893 - 2¹ = 28508639891 is a prime.

Together with 28508639891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28508639891) 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, 14254319946 + 14254319947.

It is an arithmetic number, because the mean of its divisors is an integer number (14254319947).

Almost surely, 2^28508639893 is an apocalyptic number.

It is an amenable number.

28508639893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508639893 is an equidigital number, since it uses as much as digits as its factorization.

28508639893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 28508639893 in words is "twenty-eight billion, five hundred eight million, six hundred thirty-nine thousand, eight hundred ninety-three".