28004393 has 2 divisors, whose sum is σ = 28004394. Its totient is φ = 28004392.

The previous prime is 28004369. The next prime is 28004419. The reversal of 28004393 is 39340082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 8219689 = 4448^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 28004393 - 2⁶ = 28004329 is a prime.

It is not a weakly prime, because it can be changed into another prime (28004323) 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 as a sum of consecutive naturals, namely, 14002196 + 14002197.

It is an arithmetic number, because the mean of its divisors is an integer number (14002197).

Almost surely, 2^28004393 is an apocalyptic number.

It is an amenable number.

28004393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28004393 is an equidigital number, since it uses as much as digits as its factorization.

28004393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 28004393 is about 5291.9177053314. The cubic root of 28004393 is about 303.6747769944.

The spelling of 28004393 in words is "twenty-eight million, four thousand, three hundred ninety-three".