28368643 has 2 divisors, whose sum is σ = 28368644. Its totient is φ = 28368642.

The previous prime is 28368629. The next prime is 28368701. The reversal of 28368643 is 34686382.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28368643 is a prime.

It is a super-2 number, since 2×28368643² = 1609559811322898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28368596 and 28368605.

It is not a weakly prime, because it can be changed into another prime (28368143) 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, 14184321 + 14184322.

It is an arithmetic number, because the mean of its divisors is an integer number (14184322).

Almost surely, 2^28368643 is an apocalyptic number.

28368643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28368643 is an equidigital number, since it uses as much as digits as its factorization.

28368643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The square root of 28368643 is about 5326.2222071558. Note that the first 4 decimals coincide. The cubic root of 28368643 is about 304.9857307666.

The spelling of 28368643 in words is "twenty-eight million, three hundred sixty-eight thousand, six hundred forty-three".