28812103 has 4 divisors (see below), whose sum is σ = 28826280. Its totient is φ = 28797928.

The previous prime is 28812101. The next prime is 28812137. The reversal of 28812103 is 30121882.

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 28812103 - 2¹ = 28812101 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 (28812101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400 + ... + 8317.

It is an arithmetic number, because the mean of its divisors is an integer number (7206570).

Almost surely, 2^28812103 is an apocalyptic number.

28812103 is a deficient number, since it is larger than the sum of its proper divisors (14177).

28812103 is a wasteful number, since it uses less digits than its factorization.

28812103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14176.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28812103 is about 5367.6906580018. The cubic root of 28812103 is about 306.5667051063.

Adding to 28812103 its reverse (30121882), we get a palindrome (58933985).

The spelling of 28812103 in words is "twenty-eight million, eight hundred twelve thousand, one hundred three".