28303315 has 4 divisors (see below), whose sum is σ = 33963984. Its totient is φ = 22642648.

The previous prime is 28303313. The next prime is 28303337. The reversal of 28303315 is 51330382.

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 28303315 - 2¹ = 28303313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28303315.

It is not an unprimeable number, because it can be changed into a prime (28303313) 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, 2830327 + ... + 2830336.

It is an arithmetic number, because the mean of its divisors is an integer number (8490996).

Almost surely, 2^28303315 is an apocalyptic number.

28303315 is a deficient number, since it is larger than the sum of its proper divisors (5660669).

28303315 is an equidigital number, since it uses as much as digits as its factorization.

28303315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660668.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 28303315 is about 5320.0859955456. The cubic root of 28303315 is about 304.7514413163.

Adding to 28303315 its reverse (51330382), we get a palindrome (79633697).

The spelling of 28303315 in words is "twenty-eight million, three hundred three thousand, three hundred fifteen".