28006243 has 2 divisors, whose sum is σ = 28006244. Its totient is φ = 28006242.

The previous prime is 28006229. The next prime is 28006261. The reversal of 28006243 is 34260082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28006243 is a prime.

It is not a weakly prime, because it can be changed into another prime (28006213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14003121 + 14003122.

It is an arithmetic number, because the mean of its divisors is an integer number (14003122).

Almost surely, 2^28006243 is an apocalyptic number.

28006243 is a deficient number, since it is larger than the sum of its proper divisors (1).

28006243 is an equidigital number, since it uses as much as digits as its factorization.

28006243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28006243 is about 5292.0924973020. The cubic root of 28006243 is about 303.6814638735.

The spelling of 28006243 in words is "twenty-eight million, six thousand, two hundred forty-three".