28324643 has 2 divisors, whose sum is σ = 28324644. Its totient is φ = 28324642.

The previous prime is 28324633. The next prime is 28324651. The reversal of 28324643 is 34642382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28324643 - 2¹⁸ = 28062499 is a prime.

It is not a weakly prime, because it can be changed into another prime (28324633) 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, 14162321 + 14162322.

It is an arithmetic number, because the mean of its divisors is an integer number (14162322).

Almost surely, 2^28324643 is an apocalyptic number.

28324643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28324643 is an equidigital number, since it uses as much as digits as its factorization.

28324643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 32.

The square root of 28324643 is about 5322.0900969450. The cubic root of 28324643 is about 304.8279707122.

The spelling of 28324643 in words is "twenty-eight million, three hundred twenty-four thousand, six hundred forty-three".