28961717 has 2 divisors, whose sum is σ = 28961718. Its totient is φ = 28961716.

The previous prime is 28961711. The next prime is 28961731. The reversal of 28961717 is 71716982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25542916 + 3418801 = 5054^2 + 1849^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961717 - 2⁴ = 28961701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28961711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14480858 + 14480859.

It is an arithmetic number, because the mean of its divisors is an integer number (14480859).

Almost surely, 2^28961717 is an apocalyptic number.

It is an amenable number.

28961717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961717 is an equidigital number, since it uses as much as digits as its factorization.

28961717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 41.

The square root of 28961717 is about 5381.6091459711. The cubic root of 28961717 is about 307.0964305010.

The spelling of 28961717 in words is "twenty-eight million, nine hundred sixty-one thousand, seven hundred seventeen".