28074494681 has 2 divisors, whose sum is σ = 28074494682. Its totient is φ = 28074494680.

The previous prime is 28074494659. The next prime is 28074494683. The reversal of 28074494681 is 18649447082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23190721225 + 4883773456 = 152285^2 + 69884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28074494681 is a prime.

It is a super-2 number, since 2×28074494681² (a number of 22 digits) contains 22 as substring.

Together with 28074494683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28074494683) 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, 14037247340 + 14037247341.

It is an arithmetic number, because the mean of its divisors is an integer number (14037247341).

Almost surely, 2^28074494681 is an apocalyptic number.

It is an amenable number.

28074494681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28074494681 is an equidigital number, since it uses as much as digits as its factorization.

28074494681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 28074494681 in words is "twenty-eight billion, seventy-four million, four hundred ninety-four thousand, six hundred eighty-one".