28321303 has 16 divisors (see below), whose sum is σ = 31617216. Its totient is φ = 25231360.

The previous prime is 28321301. The next prime is 28321331. The reversal of 28321303 is 30312382.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28321303 - 2¹ = 28321301 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 (28321301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43863 + ... + 44503.

It is an arithmetic number, because the mean of its divisors is an integer number (1976076).

Almost surely, 2^28321303 is an apocalyptic number.

28321303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28321303 is a deficient number, since it is larger than the sum of its proper divisors (3295913).

28321303 is a wasteful number, since it uses less digits than its factorization.

28321303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 28321303 is about 5321.7763011987. The cubic root of 28321303 is about 304.8159886201.

Adding to 28321303 its reverse (30312382), we get a palindrome (58633685).

The spelling of 28321303 in words is "twenty-eight million, three hundred twenty-one thousand, three hundred three".