28644659 has 2 divisors, whose sum is σ = 28644660. Its totient is φ = 28644658.

The previous prime is 28644641. The next prime is 28644701. The reversal of 28644659 is 95644682.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28644659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28644619) 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, 14322329 + 14322330.

It is an arithmetic number, because the mean of its divisors is an integer number (14322330).

Almost surely, 2^28644659 is an apocalyptic number.

28644659 is a deficient number, since it is larger than the sum of its proper divisors (1).

28644659 is an equidigital number, since it uses as much as digits as its factorization.

28644659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 44.

The square root of 28644659 is about 5352.0705339149. The cubic root of 28644659 is about 305.9716713775.

The spelling of 28644659 in words is "twenty-eight million, six hundred forty-four thousand, six hundred fifty-nine".