28344403 has 2 divisors, whose sum is σ = 28344404. Its totient is φ = 28344402.

The previous prime is 28344401. The next prime is 28344451. The reversal of 28344403 is 30444382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28344403 - 2¹ = 28344401 is a prime.

Together with 28344401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28344401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172201 + 14172202.

It is an arithmetic number, because the mean of its divisors is an integer number (14172202).

Almost surely, 2^28344403 is an apocalyptic number.

28344403 is a deficient number, since it is larger than the sum of its proper divisors (1).

28344403 is an equidigital number, since it uses as much as digits as its factorization.

28344403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 28344403 is about 5323.9461868054. The cubic root of 28344403 is about 304.8988395142.

Adding to 28344403 its reverse (30444382), we get a palindrome (58788785).

The spelling of 28344403 in words is "twenty-eight million, three hundred forty-four thousand, four hundred three".