28304641 has 2 divisors, whose sum is σ = 28304642. Its totient is φ = 28304640.

The previous prime is 28304569. The next prime is 28304659. The reversal of 28304641 is 14640382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 172225 = 5304^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 28304641 - 2²³ = 19916033 is a prime.

It is not a weakly prime, because it can be changed into another prime (23304641) 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, 14152320 + 14152321.

It is an arithmetic number, because the mean of its divisors is an integer number (14152321).

Almost surely, 2^28304641 is an apocalyptic number.

It is an amenable number.

28304641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28304641 is an equidigital number, since it uses as much as digits as its factorization.

28304641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 28304641 is about 5320.2106161317. The cubic root of 28304641 is about 304.7562004067.

The spelling of 28304641 in words is "twenty-eight million, three hundred four thousand, six hundred forty-one".