28345013 has 2 divisors, whose sum is σ = 28345014. Its totient is φ = 28345012.

The previous prime is 28345007. The next prime is 28345021. The reversal of 28345013 is 31054382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27636049 + 708964 = 5257^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 28345013 - 2⁶ = 28344949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28345813) 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, 14172506 + 14172507.

It is an arithmetic number, because the mean of its divisors is an integer number (14172507).

Almost surely, 2^28345013 is an apocalyptic number.

It is an amenable number.

28345013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28345013 is an equidigital number, since it uses as much as digits as its factorization.

28345013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 28345013 is about 5324.0034748298. The cubic root of 28345013 is about 304.9010267416.

Adding to 28345013 its reverse (31054382), we get a palindrome (59399395).

The spelling of 28345013 in words is "twenty-eight million, three hundred forty-five thousand, thirteen".