28008271 has 4 divisors (see below), whose sum is σ = 28026832. Its totient is φ = 27989712.

The previous prime is 28008269. The next prime is 28008307. The reversal of 28008271 is 17280082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28008271 - 2¹ = 28008269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28008251) 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 in 3 ways as a sum of consecutive naturals, for example, 6795 + ... + 10108.

It is an arithmetic number, because the mean of its divisors is an integer number (7006708).

Almost surely, 2^28008271 is an apocalyptic number.

28008271 is a deficient number, since it is larger than the sum of its proper divisors (18561).

28008271 is a wasteful number, since it uses less digits than its factorization.

28008271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18560.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28008271 is about 5292.2841004617. The cubic root of 28008271 is about 303.6887938004.

The spelling of 28008271 in words is "twenty-eight million, eight thousand, two hundred seventy-one".