28981333 has 2 divisors, whose sum is σ = 28981334. Its totient is φ = 28981332.

The previous prime is 28981321. The next prime is 28981339. The reversal of 28981333 is 33318982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23882769 + 5098564 = 4887^2 + 2258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28981333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28981292 and 28981301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28981339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14490666 + 14490667.

It is an arithmetic number, because the mean of its divisors is an integer number (14490667).

Almost surely, 2^28981333 is an apocalyptic number.

It is an amenable number.

28981333 is a deficient number, since it is larger than the sum of its proper divisors (1).

28981333 is an equidigital number, since it uses as much as digits as its factorization.

28981333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 28981333 is about 5383.4313406971. The cubic root of 28981333 is about 307.1657478008.

The spelling of 28981333 in words is "twenty-eight million, nine hundred eighty-one thousand, three hundred thirty-three".