28216711 has 2 divisors, whose sum is σ = 28216712. Its totient is φ = 28216710.

The previous prime is 28216703. The next prime is 28216751. The reversal of 28216711 is 11761282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28216711 - 2³ = 28216703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28216711.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28216751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14108355 + 14108356.

It is an arithmetic number, because the mean of its divisors is an integer number (14108356).

Almost surely, 2^28216711 is an apocalyptic number.

28216711 is a deficient number, since it is larger than the sum of its proper divisors (1).

28216711 is an equidigital number, since it uses as much as digits as its factorization.

28216711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 28216711 is about 5311.9404175875. The cubic root of 28216711 is about 304.4402921460.

Adding to 28216711 its reverse (11761282), we get a palindrome (39977993).

The spelling of 28216711 in words is "twenty-eight million, two hundred sixteen thousand, seven hundred eleven".