28422217 has 2 divisors, whose sum is σ = 28422218. Its totient is φ = 28422216.

The previous prime is 28422203. The next prime is 28422221. The reversal of 28422217 is 71222482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23242041 + 5180176 = 4821^2 + 2276^2 .

It is a cyclic number.

It is not a de Polignac number, because 28422217 - 2¹¹ = 28420169 is a prime.

It is not a weakly prime, because it can be changed into another prime (28422617) 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, 14211108 + 14211109.

It is an arithmetic number, because the mean of its divisors is an integer number (14211109).

Almost surely, 2^28422217 is an apocalyptic number.

It is an amenable number.

28422217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28422217 is an equidigital number, since it uses as much as digits as its factorization.

28422217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 28.

The square root of 28422217 is about 5331.2491031652. The cubic root of 28422217 is about 305.1775979015.

Adding to 28422217 its reverse (71222482), we get a palindrome (99644699).

The spelling of 28422217 in words is "twenty-eight million, four hundred twenty-two thousand, two hundred seventeen".