28363813 has 2 divisors, whose sum is σ = 28363814. Its totient is φ = 28363812.

The previous prime is 28363763. The next prime is 28363817. The reversal of 28363813 is 31836382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24275329 + 4088484 = 4927^2 + 2022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28363813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28363817) 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, 14181906 + 14181907.

It is an arithmetic number, because the mean of its divisors is an integer number (14181907).

Almost surely, 2^28363813 is an apocalyptic number.

It is an amenable number.

28363813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28363813 is an equidigital number, since it uses as much as digits as its factorization.

28363813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 28363813 is about 5325.7687707973. The cubic root of 28363813 is about 304.9684209892.

The spelling of 28363813 in words is "twenty-eight million, three hundred sixty-three thousand, eight hundred thirteen".