28303013 has 2 divisors, whose sum is σ = 28303014. Its totient is φ = 28303012.

The previous prime is 28303003. The next prime is 28303019. The reversal of 28303013 is 31030382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20811844 + 7491169 = 4562^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 28303013 - 2¹⁰ = 28301989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28303019) 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, 14151506 + 14151507.

It is an arithmetic number, because the mean of its divisors is an integer number (14151507).

Almost surely, 2^28303013 is an apocalyptic number.

It is an amenable number.

28303013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28303013 is an equidigital number, since it uses as much as digits as its factorization.

28303013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 28303013 is about 5320.0576124700. The cubic root of 28303013 is about 304.7503574002.

Adding to 28303013 its reverse (31030382), we get a palindrome (59333395).

The spelling of 28303013 in words is "twenty-eight million, three hundred three thousand, thirteen".