28748449 has 2 divisors, whose sum is σ = 28748450. Its totient is φ = 28748448.

The previous prime is 28748429. The next prime is 28748453. The reversal of 28748449 is 94484782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26625600 + 2122849 = 5160^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 28748449 - 2⁵ = 28748417 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28748399 and 28748408.

It is not a weakly prime, because it can be changed into another prime (28748429) 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, 14374224 + 14374225.

It is an arithmetic number, because the mean of its divisors is an integer number (14374225).

Almost surely, 2^28748449 is an apocalyptic number.

It is an amenable number.

28748449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28748449 is an equidigital number, since it uses as much as digits as its factorization.

28748449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 28748449 is about 5361.7580139354. The cubic root of 28748449 is about 306.3407747570.

The spelling of 28748449 in words is "twenty-eight million, seven hundred forty-eight thousand, four hundred forty-nine".