28301105813 has 4 divisors (see below), whose sum is σ = 28688792268. Its totient is φ = 27913419360.

The previous prime is 28301105797. The next prime is 28301105873. The reversal of 28301105813 is 31850110382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31850110382 = 2 ⋅15925055191.

It can be written as a sum of positive squares in 2 ways, for example, as 5553528484 + 22747577329 = 74522^2 + 150823^2 .

It is a cyclic number.

It is not a de Polignac number, because 28301105813 - 2⁴ = 28301105797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28301105813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28301105873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193843118 + ... + 193843263.

It is an arithmetic number, because the mean of its divisors is an integer number (7172198067).

Almost surely, 2^28301105813 is an apocalyptic number.

It is an amenable number.

28301105813 is a deficient number, since it is larger than the sum of its proper divisors (387686455).

28301105813 is an equidigital number, since it uses as much as digits as its factorization.

28301105813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387686454.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 28301105813 in words is "twenty-eight billion, three hundred one million, one hundred five thousand, eight hundred thirteen".