28271447 has 2 divisors, whose sum is σ = 28271448. Its totient is φ = 28271446.

The previous prime is 28271429. The next prime is 28271471. The reversal of 28271447 is 74417282.

It is a happy number.

28271447 is nontrivially palindromic in base 5.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28271447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28271497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14135723 + 14135724.

It is an arithmetic number, because the mean of its divisors is an integer number (14135724).

Almost surely, 2^28271447 is an apocalyptic number.

28271447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28271447 is an equidigital number, since it uses as much as digits as its factorization.

28271447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 35.

The square root of 28271447 is about 5317.0900876325. The cubic root of 28271447 is about 304.6370204884.

The spelling of 28271447 in words is "twenty-eight million, two hundred seventy-one thousand, four hundred forty-seven".