28904243 has 2 divisors, whose sum is σ = 28904244. Its totient is φ = 28904242.

The previous prime is 28904219. The next prime is 28904251. The reversal of 28904243 is 34240982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28904243 - 2¹⁰ = 28903219 is a prime.

It is equal to p_1794119 and since 28904243 and 1794119 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28904203) 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, 14452121 + 14452122.

It is an arithmetic number, because the mean of its divisors is an integer number (14452122).

Almost surely, 2^28904243 is an apocalyptic number.

28904243 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904243 is an equidigital number, since it uses as much as digits as its factorization.

28904243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28904243 is about 5376.2666414530. The cubic root of 28904243 is about 306.8931535505.

The spelling of 28904243 in words is "twenty-eight million, nine hundred four thousand, two hundred forty-three".