28238291 has 2 divisors, whose sum is σ = 28238292. Its totient is φ = 28238290.

The previous prime is 28238281. The next prime is 28238293. The reversal of 28238291 is 19283282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28238291 - 2¹⁸ = 27976147 is a prime.

It is a Sophie Germain prime.

Together with 28238293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28238293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119145 + 14119146.

It is an arithmetic number, because the mean of its divisors is an integer number (14119146).

Almost surely, 2^28238291 is an apocalyptic number.

28238291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28238291 is an equidigital number, since it uses as much as digits as its factorization.

28238291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 28238291 is about 5313.9713021431. The cubic root of 28238291 is about 304.5178838417.

The spelling of 28238291 in words is "twenty-eight million, two hundred thirty-eight thousand, two hundred ninety-one".