28311449 has 2 divisors, whose sum is σ = 28311450. Its totient is φ = 28311448.

The previous prime is 28311421. The next prime is 28311457. The reversal of 28311449 is 94411382.

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., 26337424 + 1974025 = 5132^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28311449 - 2⁸ = 28311193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28311419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155724 + 14155725.

It is an arithmetic number, because the mean of its divisors is an integer number (14155725).

Almost surely, 2^28311449 is an apocalyptic number.

It is an amenable number.

28311449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311449 is an equidigital number, since it uses as much as digits as its factorization.

28311449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 28311449 is about 5320.8504019564. The cubic root of 28311449 is about 304.7806323704.

The spelling of 28311449 in words is "twenty-eight million, three hundred eleven thousand, four hundred forty-nine".