28193317 has 2 divisors, whose sum is σ = 28193318. Its totient is φ = 28193316.

The previous prime is 28193287. The next prime is 28193383. The reversal of 28193317 is 71339182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22268961 + 5924356 = 4719^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 28193317 - 2⁷ = 28193189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28193617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14096658 + 14096659.

It is an arithmetic number, because the mean of its divisors is an integer number (14096659).

Almost surely, 2^28193317 is an apocalyptic number.

It is an amenable number.

28193317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28193317 is an equidigital number, since it uses as much as digits as its factorization.

28193317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 28193317 is about 5309.7379408027. The cubic root of 28193317 is about 304.3561334435.

The spelling of 28193317 in words is "twenty-eight million, one hundred ninety-three thousand, three hundred seventeen".