28321047481 has 2 divisors, whose sum is σ = 28321047482. Its totient is φ = 28321047480.

The previous prime is 28321047479. The next prime is 28321047551. The reversal of 28321047481 is 18474012382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26297487225 + 2023560256 = 162165^2 + 44984^2 .

It is a cyclic number.

It is not a de Polignac number, because 28321047481 - 2¹ = 28321047479 is a prime.

It is a super-2 number, since 2×28321047481² (a number of 22 digits) contains 22 as substring.

Together with 28321047479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28321047421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160523740 + 14160523741.

It is an arithmetic number, because the mean of its divisors is an integer number (14160523741).

Almost surely, 2^28321047481 is an apocalyptic number.

It is an amenable number.

28321047481 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321047481 is an equidigital number, since it uses as much as digits as its factorization.

28321047481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 28321047481 in words is "twenty-eight billion, three hundred twenty-one million, forty-seven thousand, four hundred eighty-one".