28430503 has 4 divisors (see below), whose sum is σ = 29347648. Its totient is φ = 27513360.

The previous prime is 28430491. The next prime is 28430509. The reversal of 28430503 is 30503482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28430503 - 2⁵ = 28430471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28430509) 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, 458526 + ... + 458587.

It is an arithmetic number, because the mean of its divisors is an integer number (7336912).

Almost surely, 2^28430503 is an apocalyptic number.

28430503 is a deficient number, since it is larger than the sum of its proper divisors (917145).

28430503 is an equidigital number, since it uses as much as digits as its factorization.

28430503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917144.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 28430503 is about 5332.0261627265. The cubic root of 28430503 is about 305.2072514162.

Adding to 28430503 its reverse (30503482), we get a palindrome (58933985).

The spelling of 28430503 in words is "twenty-eight million, four hundred thirty thousand, five hundred three".