28208447 has 2 divisors, whose sum is σ = 28208448. Its totient is φ = 28208446.

The previous prime is 28208443. The next prime is 28208459. The reversal of 28208447 is 74480282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28208447 - 2² = 28208443 is a prime.

It is equal to p_1753577 and since 28208447 and 1753577 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28208443) 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, 14104223 + 14104224.

It is an arithmetic number, because the mean of its divisors is an integer number (14104224).

Almost surely, 2^28208447 is an apocalyptic number.

28208447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28208447 is an equidigital number, since it uses as much as digits as its factorization.

28208447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28208447 is about 5311.1624904535. The cubic root of 28208447 is about 304.4105681499.

The spelling of 28208447 in words is "twenty-eight million, two hundred eight thousand, four hundred forty-seven".