28009303 has 8 divisors (see below), whose sum is σ = 32153472. Its totient is φ = 23900856.

The previous prime is 28009301. The next prime is 28009307. The reversal of 28009303 is 30390082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28009303 - 2¹ = 28009301 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 (28009301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7225 + ... + 10402.

It is an arithmetic number, because the mean of its divisors is an integer number (4019184).

Almost surely, 2^28009303 is an apocalyptic number.

28009303 is a deficient number, since it is larger than the sum of its proper divisors (4144169).

28009303 is a wasteful number, since it uses less digits than its factorization.

28009303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17861.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 28009303 is about 5292.3815999982. The cubic root of 28009303 is about 303.6925236866.

Adding to 28009303 its reverse (30390082), we get a palindrome (58399385).

The spelling of 28009303 in words is "twenty-eight million, nine thousand, three hundred three".