28343385817 has 2 divisors, whose sum is σ = 28343385818. Its totient is φ = 28343385816.

The previous prime is 28343385797. The next prime is 28343385853. The reversal of 28343385817 is 71858334382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16738925641 + 11604460176 = 129379^2 + 107724^2 .

It is a cyclic number.

It is not a de Polignac number, because 28343385817 - 2⁷ = 28343385689 is a prime.

It is not a weakly prime, because it can be changed into another prime (28343385517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14171692908 + 14171692909.

It is an arithmetic number, because the mean of its divisors is an integer number (14171692909).

Almost surely, 2^28343385817 is an apocalyptic number.

It is an amenable number.

28343385817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28343385817 is an equidigital number, since it uses as much as digits as its factorization.

28343385817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 52.

The spelling of 28343385817 in words is "twenty-eight billion, three hundred forty-three million, three hundred eighty-five thousand, eight hundred seventeen".