28666843 has 2 divisors, whose sum is σ = 28666844. Its totient is φ = 28666842.

The previous prime is 28666837. The next prime is 28666903. The reversal of 28666843 is 34866682.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28666843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28666843.

It is not a weakly prime, because it can be changed into another prime (28666543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333421 + 14333422.

It is an arithmetic number, because the mean of its divisors is an integer number (14333422).

Almost surely, 2^28666843 is an apocalyptic number.

28666843 is a deficient number, since it is larger than the sum of its proper divisors (1).

28666843 is an equidigital number, since it uses as much as digits as its factorization.

28666843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 43.

The square root of 28666843 is about 5354.1426017617. The cubic root of 28666843 is about 306.0506380947.

The spelling of 28666843 in words is "twenty-eight million, six hundred sixty-six thousand, eight hundred forty-three".