28349393 has 2 divisors, whose sum is σ = 28349394. Its totient is φ = 28349392.

The previous prime is 28349389. The next prime is 28349401. The reversal of 28349393 is 39394382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27112849 + 1236544 = 5207^2 + 1112^2 .

It is a cyclic number.

It is not a de Polignac number, because 28349393 - 2² = 28349389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28349393.

It is not a weakly prime, because it can be changed into another prime (28349383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14174696 + 14174697.

It is an arithmetic number, because the mean of its divisors is an integer number (14174697).

Almost surely, 2^28349393 is an apocalyptic number.

It is an amenable number.

28349393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28349393 is an equidigital number, since it uses as much as digits as its factorization.

28349393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 28349393 is about 5324.4148035254. The cubic root of 28349393 is about 304.9167308293.

The spelling of 28349393 in words is "twenty-eight million, three hundred forty-nine thousand, three hundred ninety-three".