28028449 has 2 divisors, whose sum is σ = 28028450. Its totient is φ = 28028448.

The previous prime is 28028447. The next prime is 28028491. The reversal of 28028449 is 94482082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25070049 + 2958400 = 5007^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 28028449 - 2¹ = 28028447 is a prime.

Together with 28028447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28028443) 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, 14014224 + 14014225.

It is an arithmetic number, because the mean of its divisors is an integer number (14014225).

Almost surely, 2^28028449 is an apocalyptic number.

It is an amenable number.

28028449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28028449 is an equidigital number, since it uses as much as digits as its factorization.

28028449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 28028449 is about 5294.1901174778. The cubic root of 28028449 is about 303.7617051381.

The spelling of 28028449 in words is "twenty-eight million, twenty-eight thousand, four hundred forty-nine".