28644013 has 2 divisors, whose sum is σ = 28644014. Its totient is φ = 28644012.

The previous prime is 28643999. The next prime is 28644017. The reversal of 28644013 is 31044682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28494244 + 149769 = 5338^2 + 387^2 .

It is a cyclic number.

It is not a de Polignac number, because 28644013 - 2⁵ = 28643981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28644017) 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, 14322006 + 14322007.

It is an arithmetic number, because the mean of its divisors is an integer number (14322007).

Almost surely, 2^28644013 is an apocalyptic number.

It is an amenable number.

28644013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28644013 is an equidigital number, since it uses as much as digits as its factorization.

28644013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 28644013 is about 5352.0101830994. The cubic root of 28644013 is about 305.9693712491.

Adding to 28644013 its reverse (31044682), we get a palindrome (59688695).

The spelling of 28644013 in words is "twenty-eight million, six hundred forty-four thousand, thirteen".