28843993 has 2 divisors, whose sum is σ = 28843994. Its totient is φ = 28843992.

The previous prime is 28843949. The next prime is 28844021. The reversal of 28843993 is 39934882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17372224 + 11471769 = 4168^2 + 3387^2 .

It is a cyclic number.

It is not a de Polignac number, because 28843993 - 2⁹ = 28843481 is a prime.

It is not a weakly prime, because it can be changed into another prime (28843933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14421996 + 14421997.

It is an arithmetic number, because the mean of its divisors is an integer number (14421997).

Almost surely, 2^28843993 is an apocalyptic number.

It is an amenable number.

28843993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28843993 is an equidigital number, since it uses as much as digits as its factorization.

28843993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 28843993 is about 5370.6603876991. The cubic root of 28843993 is about 306.6797687901.

The spelling of 28843993 in words is "twenty-eight million, eight hundred forty-three thousand, nine hundred ninety-three".