28303317 has 64 divisors (see below), whose sum is σ = 53084160. Its totient is φ = 14522112.

The previous prime is 28303313. The next prime is 28303337. The reversal of 28303317 is 71330382.

It is not a de Polignac number, because 28303317 - 2² = 28303313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 73708 + ... + 74090.

It is an arithmetic number, because the mean of its divisors is an integer number (829440).

Almost surely, 2^28303317 is an apocalyptic number.

28303317 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28303317 is a deficient number, since it is larger than the sum of its proper divisors (24780843).

28303317 is a wasteful number, since it uses less digits than its factorization.

28303317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 28303317 is about 5320.0861835124. The cubic root of 28303317 is about 304.7514484946.

Adding to 28303317 its reverse (71330382), we get a palindrome (99633699).

The spelling of 28303317 in words is "twenty-eight million, three hundred three thousand, three hundred seventeen".