28227449 has 2 divisors, whose sum is σ = 28227450. Its totient is φ = 28227448.

The previous prime is 28227439. The next prime is 28227467. The reversal of 28227449 is 94472282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28015849 + 211600 = 5293^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 28227449 - 2¹² = 28223353 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28227439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14113724 + 14113725.

It is an arithmetic number, because the mean of its divisors is an integer number (14113725).

Almost surely, 2^28227449 is an apocalyptic number.

It is an amenable number.

28227449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28227449 is an equidigital number, since it uses as much as digits as its factorization.

28227449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 28227449 is about 5312.9510632040. The cubic root of 28227449 is about 304.4789059691.

The spelling of 28227449 in words is "twenty-eight million, two hundred twenty-seven thousand, four hundred forty-nine".