28229891 has 2 divisors, whose sum is σ = 28229892. Its totient is φ = 28229890.

The previous prime is 28229879. The next prime is 28229897. The reversal of 28229891 is 19892282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28229891 - 2⁶ = 28229827 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28229897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14114945 + 14114946.

It is an arithmetic number, because the mean of its divisors is an integer number (14114946).

Almost surely, 2^28229891 is an apocalyptic number.

28229891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28229891 is an equidigital number, since it uses as much as digits as its factorization.

28229891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 28229891 is about 5313.1808740151. The cubic root of 28229891 is about 304.4876860286.

The spelling of 28229891 in words is "twenty-eight million, two hundred twenty-nine thousand, eight hundred ninety-one".