28443307 has 2 divisors, whose sum is σ = 28443308. Its totient is φ = 28443306.

The previous prime is 28443281. The next prime is 28443313. The reversal of 28443307 is 70334482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28443307 - 2¹⁹ = 27919019 is a prime.

It is not a weakly prime, because it can be changed into another prime (28443367) 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, 14221653 + 14221654.

It is an arithmetic number, because the mean of its divisors is an integer number (14221654).

Almost surely, 2^28443307 is an apocalyptic number.

28443307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28443307 is an equidigital number, since it uses as much as digits as its factorization.

28443307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 28443307 is about 5333.2266968506. The cubic root of 28443307 is about 305.2530623906.

Adding to 28443307 its reverse (70334482), we get a palindrome (98777789).

The spelling of 28443307 in words is "twenty-eight million, four hundred forty-three thousand, three hundred seven".