28711 has 2 divisors, whose sum is σ = 28712. Its totient is φ = 28710.

The previous prime is 28703. The next prime is 28723. The reversal of 28711 is 11782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28711 - 2³ = 28703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28751) 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, 14355 + 14356.

It is an arithmetic number, because the mean of its divisors is an integer number (14356).

2²⁸⁷¹¹ is an apocalyptic number.

28711 is a deficient number, since it is larger than the sum of its proper divisors (1).

28711 is an equidigital number, since it uses as much as digits as its factorization.

28711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112, while the sum is 19.

The square root of 28711 is about 169.4432058243. The cubic root of 28711 is about 30.6207699280.

The spelling of 28711 in words is "twenty-eight thousand, seven hundred eleven".