28249229 has 2 divisors, whose sum is σ = 28249230. Its totient is φ = 28249228.

The previous prime is 28249187. The next prime is 28249253. The reversal of 28249229 is 92294282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 4 = 5315^2 + 2^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28249229 is a prime.

It is a Chen prime.

It is equal to p_1755983 and since 28249229 and 1755983 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28249192 and 28249201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28249279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124614 + 14124615.

It is an arithmetic number, because the mean of its divisors is an integer number (14124615).

Almost surely, 2^28249229 is an apocalyptic number.

It is an amenable number.

28249229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249229 is an equidigital number, since it uses as much as digits as its factorization.

28249229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 28249229 is about 5315.0003762935. Note that the first 3 decimals coincide. The cubic root of 28249229 is about 304.5571967336.

The spelling of 28249229 in words is "twenty-eight million, two hundred forty-nine thousand, two hundred twenty-nine".