28047871 has 2 divisors, whose sum is σ = 28047872. Its totient is φ = 28047870.

The previous prime is 28047869. The next prime is 28047881. The reversal of 28047871 is 17874082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28047871 - 2¹ = 28047869 is a prime.

Together with 28047869, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28047871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28047881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14023935 + 14023936.

It is an arithmetic number, because the mean of its divisors is an integer number (14023936).

Almost surely, 2^28047871 is an apocalyptic number.

28047871 is a deficient number, since it is larger than the sum of its proper divisors (1).

28047871 is an equidigital number, since it uses as much as digits as its factorization.

28047871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 28047871 is about 5296.0240747187. The cubic root of 28047871 is about 303.8318516960.

The spelling of 28047871 in words is "twenty-eight million, forty-seven thousand, eight hundred seventy-one".