28124813 has 2 divisors, whose sum is σ = 28124814. Its totient is φ = 28124812.

The previous prime is 28124797. The next prime is 28124819. The reversal of 28124813 is 31842182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 7856809 = 4502^2 + 2803^2 .

It is a cyclic number.

It is not a de Polignac number, because 28124813 - 2⁴ = 28124797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28124819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14062406 + 14062407.

It is an arithmetic number, because the mean of its divisors is an integer number (14062407).

Almost surely, 2^28124813 is an apocalyptic number.

It is an amenable number.

28124813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28124813 is an equidigital number, since it uses as much as digits as its factorization.

28124813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 28124813 is about 5303.2832283407. The cubic root of 28124813 is about 304.1094257791.

Adding to 28124813 its reverse (31842182), we get a palindrome (59966995).

The spelling of 28124813 in words is "twenty-eight million, one hundred twenty-four thousand, eight hundred thirteen".