28644641 has 2 divisors, whose sum is σ = 28644642. Its totient is φ = 28644640.

The previous prime is 28644619. The next prime is 28644659. The reversal of 28644641 is 14644682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23804641 + 4840000 = 4879^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 28644641 - 2¹⁰ = 28643617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28644611) 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, 14322320 + 14322321.

It is an arithmetic number, because the mean of its divisors is an integer number (14322321).

Almost surely, 2^28644641 is an apocalyptic number.

It is an amenable number.

28644641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28644641 is an equidigital number, since it uses as much as digits as its factorization.

28644641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 35.

The square root of 28644641 is about 5352.0688523224. The cubic root of 28644641 is about 305.9716072877.

The spelling of 28644641 in words is "twenty-eight million, six hundred forty-four thousand, six hundred forty-one".