28489313 has 2 divisors, whose sum is σ = 28489314. Its totient is φ = 28489312.

The previous prime is 28489289. The next prime is 28489319. The reversal of 28489313 is 31398482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21687649 + 6801664 = 4657^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 28489313 - 2⁸ = 28489057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28489319) 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, 14244656 + 14244657.

It is an arithmetic number, because the mean of its divisors is an integer number (14244657).

Almost surely, 2^28489313 is an apocalyptic number.

It is an amenable number.

28489313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28489313 is an equidigital number, since it uses as much as digits as its factorization.

28489313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 28489313 is about 5337.5381029085. The cubic root of 28489313 is about 305.4175522603.

The spelling of 28489313 in words is "twenty-eight million, four hundred eighty-nine thousand, three hundred thirteen".