28380503 has 4 divisors (see below), whose sum is σ = 28413528. Its totient is φ = 28347480.

The previous prime is 28380479. The next prime is 28380523. The reversal of 28380503 is 30508382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30508382 = 2 ⋅15254191.

It is a cyclic number.

It is not a de Polignac number, because 28380503 - 2²² = 24186199 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 (28380523) 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, 15188 + ... + 16953.

It is an arithmetic number, because the mean of its divisors is an integer number (7103382).

Almost surely, 2^28380503 is an apocalyptic number.

28380503 is a deficient number, since it is larger than the sum of its proper divisors (33025).

28380503 is an equidigital number, since it uses as much as digits as its factorization.

28380503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33024.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 28380503 is about 5327.3354502978. The cubic root of 28380503 is about 305.0282263584.

Adding to 28380503 its reverse (30508382), we get a palindrome (58888885).

The spelling of 28380503 in words is "twenty-eight million, three hundred eighty thousand, five hundred three".