28409333 has 2 divisors, whose sum is σ = 28409334. Its totient is φ = 28409332.

The previous prime is 28409287. The next prime is 28409341. The reversal of 28409333 is 33390482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27857284 + 552049 = 5278^2 + 743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28409333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28409333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28409233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204666 + 14204667.

It is an arithmetic number, because the mean of its divisors is an integer number (14204667).

Almost surely, 2^28409333 is an apocalyptic number.

It is an amenable number.

28409333 is a deficient number, since it is larger than the sum of its proper divisors (1).

28409333 is an equidigital number, since it uses as much as digits as its factorization.

28409333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 28409333 is about 5330.0406189822. The cubic root of 28409333 is about 305.1314778488.

The spelling of 28409333 in words is "twenty-eight million, four hundred nine thousand, three hundred thirty-three".