28216503 has 36 divisors (see below), whose sum is σ = 47927880. Its totient is φ = 15948576.

The previous prime is 28216499. The next prime is 28216519. The reversal of 28216503 is 30561282.

28216503 is a `hidden beast` number, since 2 + 8 + 2 + 1 + 650 + 3 = 666.

It is not a de Polignac number, because 28216503 - 2² = 28216499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28216553) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 47776 + ... + 48362.

It is an arithmetic number, because the mean of its divisors is an integer number (1331330).

Almost surely, 2^28216503 is an apocalyptic number.

28216503 is a deficient number, since it is larger than the sum of its proper divisors (19711377).

28216503 is a wasteful number, since it uses less digits than its factorization.

28216503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28216503 is about 5311.9208390186. The cubic root of 28216503 is about 304.4395440818.

Adding to 28216503 its reverse (30561282), we get a palindrome (58777785).

The spelling of 28216503 in words is "twenty-eight million, two hundred sixteen thousand, five hundred three".