28771 has 2 divisors, whose sum is σ = 28772. Its totient is φ = 28770.

The previous prime is 28759. The next prime is 28789. The reversal of 28771 is 17782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28771 - 2⁷ = 28643 is a prime.

28771 is a lucky number.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (28711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14385 + 14386.

It is an arithmetic number, because the mean of its divisors is an integer number (14386).

2²⁸⁷⁷¹ is an apocalyptic number.

28771 is a deficient number, since it is larger than the sum of its proper divisors (1).

28771 is an equidigital number, since it uses as much as digits as its factorization.

28771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 25.

The square root of 28771 is about 169.6201638957. The cubic root of 28771 is about 30.6420854268.

The spelling of 28771 in words is "twenty-eight thousand, seven hundred seventy-one".