28081788673 has 2 divisors, whose sum is σ = 28081788674. Its totient is φ = 28081788672.

The previous prime is 28081788653. The next prime is 28081788677. The reversal of 28081788673 is 37688718082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27467095824 + 614692849 = 165732^2 + 24793^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081788673 - 2²⁵ = 28048234241 is a prime.

It is a super-2 number, since 2×28081788673² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28081788677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040894336 + 14040894337.

It is an arithmetic number, because the mean of its divisors is an integer number (14040894337).

Almost surely, 2^28081788673 is an apocalyptic number.

It is an amenable number.

28081788673 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081788673 is an equidigital number, since it uses as much as digits as its factorization.

28081788673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 28081788673 in words is "twenty-eight billion, eighty-one million, seven hundred eighty-eight thousand, six hundred seventy-three".