28248397 has 2 divisors, whose sum is σ = 28248398. Its totient is φ = 28248396.

The previous prime is 28248379. The next prime is 28248401. The reversal of 28248397 is 79384282.

It is a happy number.

Together with previous prime (28248379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28238596 + 9801 = 5314^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 28248397 - 2¹¹ = 28246349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28248317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124198 + 14124199.

It is an arithmetic number, because the mean of its divisors is an integer number (14124199).

Almost surely, 2^28248397 is an apocalyptic number.

It is an amenable number.

28248397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28248397 is an equidigital number, since it uses as much as digits as its factorization.

28248397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 28248397 is about 5314.9221066729. The cubic root of 28248397 is about 304.5542067514.

The spelling of 28248397 in words is "twenty-eight million, two hundred forty-eight thousand, three hundred ninety-seven".