28303333 has 4 divisors (see below), whose sum is σ = 29279340. Its totient is φ = 27327328.

The previous prime is 28303313. The next prime is 28303337. The reversal of 28303333 is 33330382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5579044 + 22724289 = 2362^2 + 4767^2 .

It is a cyclic number.

It is not a de Polignac number, because 28303333 - 2⁹ = 28302821 is a prime.

It is a Duffinian number.

28303333 is a modest number, since divided by 3333 gives 2830 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 28303298 and 28303307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28303337) 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, 487960 + ... + 488017.

It is an arithmetic number, because the mean of its divisors is an integer number (7319835).

Almost surely, 2^28303333 is an apocalyptic number.

It is an amenable number.

28303333 is a deficient number, since it is larger than the sum of its proper divisors (976007).

28303333 is an equidigital number, since it uses as much as digits as its factorization.

28303333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976006.

The product of its (nonzero) digits is 3888, while the sum is 25.

The square root of 28303333 is about 5320.0876872473. The cubic root of 28303333 is about 304.7515059204.

The spelling of 28303333 in words is "twenty-eight million, three hundred three thousand, three hundred thirty-three".