28564447 has 2 divisors, whose sum is σ = 28564448. Its totient is φ = 28564446.

The previous prime is 28564421. The next prime is 28564451. The reversal of 28564447 is 74446582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28564447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28564477) 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, 14282223 + 14282224.

It is an arithmetic number, because the mean of its divisors is an integer number (14282224).

Almost surely, 2^28564447 is an apocalyptic number.

28564447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28564447 is an equidigital number, since it uses as much as digits as its factorization.

28564447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 40.

The square root of 28564447 is about 5344.5717321409. The cubic root of 28564447 is about 305.6858060577.

The spelling of 28564447 in words is "twenty-eight million, five hundred sixty-four thousand, four hundred forty-seven".