28518013 has 2 divisors, whose sum is σ = 28518014. Its totient is φ = 28518012.

The previous prime is 28517989. The next prime is 28518043. The reversal of 28518013 is 31081582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 10903204 = 4197^2 + 3302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28518013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28518043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14259006 + 14259007.

It is an arithmetic number, because the mean of its divisors is an integer number (14259007).

Almost surely, 2^28518013 is an apocalyptic number.

It is an amenable number.

28518013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28518013 is an equidigital number, since it uses as much as digits as its factorization.

28518013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28518013 is about 5340.2259315501. The cubic root of 28518013 is about 305.5200765760.

Adding to 28518013 its reverse (31081582), we get a palindrome (59599595).

The spelling of 28518013 in words is "twenty-eight million, five hundred eighteen thousand, thirteen".