28718761613 has 2 divisors, whose sum is σ = 28718761614. Its totient is φ = 28718761612.

The previous prime is 28718761601. The next prime is 28718761633. The reversal of 28718761613 is 31616781782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28184365924 + 534395689 = 167882^2 + 23117^2 .

It is a cyclic number.

It is not a de Polignac number, because 28718761613 - 2⁴ = 28718761597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28718761633) 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, 14359380806 + 14359380807.

It is an arithmetic number, because the mean of its divisors is an integer number (14359380807).

Almost surely, 2^28718761613 is an apocalyptic number.

It is an amenable number.

28718761613 is a deficient number, since it is larger than the sum of its proper divisors (1).

28718761613 is an equidigital number, since it uses as much as digits as its factorization.

28718761613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 50.

The spelling of 28718761613 in words is "twenty-eight billion, seven hundred eighteen million, seven hundred sixty-one thousand, six hundred thirteen".