28447 has 2 divisors, whose sum is σ = 28448. Its totient is φ = 28446.
The previous prime is 28439. The next prime is 28463. The reversal of 28447 is 74482.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 28447 - 23 = 28439 is a prime.
It is a plaindrome in base 12.
It is a nialpdrome in base 13.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (28477) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14223 + 14224.
It is an arithmetic number, because the mean of its divisors is an integer number (14224).
228447 is an apocalyptic number.
28447 is a deficient number, since it is larger than the sum of its proper divisors (1).
28447 is an equidigital number, since it uses as much as digits as its factorization.
28447 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1792, while the sum is 25.
The square root of 28447 is about 168.6623846624. The cubic root of 28447 is about 30.5266272889.
The spelling of 28447 in words is "twenty-eight thousand, four hundred forty-seven".
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