28173847693 has 2 divisors, whose sum is σ = 28173847694. Its totient is φ = 28173847692.

The previous prime is 28173847661. The next prime is 28173847721. The reversal of 28173847693 is 39674837182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24086419204 + 4087428489 = 155198^2 + 63933^2 .

It is a cyclic number.

It is not a de Polignac number, because 28173847693 - 2⁵ = 28173847661 is a prime.

It is a super-2 number, since 2×28173847693² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28173844693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086923846 + 14086923847.

It is an arithmetic number, because the mean of its divisors is an integer number (14086923847).

Almost surely, 2^28173847693 is an apocalyptic number.

It is an amenable number.

28173847693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28173847693 is an equidigital number, since it uses as much as digits as its factorization.

28173847693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 58.

The spelling of 28173847693 in words is "twenty-eight billion, one hundred seventy-three million, eight hundred forty-seven thousand, six hundred ninety-three".