28443073 has 2 divisors, whose sum is σ = 28443074. Its totient is φ = 28443072.

The previous prime is 28443071. The next prime is 28443119. The reversal of 28443073 is 37034482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 10870209 = 4192^2 + 3297^2 .

It is a cyclic number.

It is not a de Polignac number, because 28443073 - 2¹ = 28443071 is a prime.

Together with 28443071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28443071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14221536 + 14221537.

It is an arithmetic number, because the mean of its divisors is an integer number (14221537).

Almost surely, 2^28443073 is an apocalyptic number.

It is an amenable number.

28443073 is a deficient number, since it is larger than the sum of its proper divisors (1).

28443073 is an equidigital number, since it uses as much as digits as its factorization.

28443073 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 28443073 is about 5333.2047588668. The cubic root of 28443073 is about 305.2522252937.

The spelling of 28443073 in words is "twenty-eight million, four hundred forty-three thousand, seventy-three".