28032503 has 4 divisors (see below), whose sum is σ = 28370328. Its totient is φ = 27694680.

The previous prime is 28032491. The next prime is 28032523. The reversal of 28032503 is 30523082.

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 28032503 - 2¹⁸ = 27770359 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 (28032523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168788 + ... + 168953.

It is an arithmetic number, because the mean of its divisors is an integer number (7092582).

Almost surely, 2^28032503 is an apocalyptic number.

28032503 is a deficient number, since it is larger than the sum of its proper divisors (337825).

28032503 is an equidigital number, since it uses as much as digits as its factorization.

28032503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337824.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 28032503 is about 5294.5729761710. The cubic root of 28032503 is about 303.7763496704.

Adding to 28032503 its reverse (30523082), we get a palindrome (58555585).

The spelling of 28032503 in words is "twenty-eight million, thirty-two thousand, five hundred three".