28345393 has 2 divisors, whose sum is σ = 28345394. Its totient is φ = 28345392.

The previous prime is 28345381. The next prime is 28345417. The reversal of 28345393 is 39354382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21827584 + 6517809 = 4672^2 + 2553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28345393 is a prime.

It is a super-2 number, since 2×28345393² = 1606922608648898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28345333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172696 + 14172697.

It is an arithmetic number, because the mean of its divisors is an integer number (14172697).

Almost surely, 2^28345393 is an apocalyptic number.

It is an amenable number.

28345393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28345393 is an equidigital number, since it uses as much as digits as its factorization.

28345393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 37.

The square root of 28345393 is about 5324.0391621400. The cubic root of 28345393 is about 304.9023892607.

The spelling of 28345393 in words is "twenty-eight million, three hundred forty-five thousand, three hundred ninety-three".