28218811 has 2 divisors, whose sum is σ = 28218812. Its totient is φ = 28218810.

The previous prime is 28218809. The next prime is 28218833. The reversal of 28218811 is 11881282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28218811 - 2¹ = 28218809 is a prime.

Together with 28218809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28218881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109405 + 14109406.

It is an arithmetic number, because the mean of its divisors is an integer number (14109406).

Almost surely, 2^28218811 is an apocalyptic number.

28218811 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218811 is an equidigital number, since it uses as much as digits as its factorization.

28218811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 31.

The square root of 28218811 is about 5312.1380817897. The cubic root of 28218811 is about 304.4478445116.

The spelling of 28218811 in words is "twenty-eight million, two hundred eighteen thousand, eight hundred eleven".