28280003 has 4 divisors (see below), whose sum is σ = 28290648. Its totient is φ = 28269360.

The previous prime is 28279997. The next prime is 28280047. The reversal of 28280003 is 30008282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28280003 - 2⁴ = 28279987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28280803) 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 in 3 ways as a sum of consecutive naturals, for example, 2348 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (7072662).

Almost surely, 2^28280003 is an apocalyptic number.

28280003 is a deficient number, since it is larger than the sum of its proper divisors (10645).

28280003 is an equidigital number, since it uses as much as digits as its factorization.

28280003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10644.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 28280003 is about 5317.8946021899. The cubic root of 28280003 is about 304.6677489174.

Adding to 28280003 its reverse (30008282), we get a palindrome (58288285).

The spelling of 28280003 in words is "twenty-eight million, two hundred eighty thousand, three".