28248641 has 2 divisors, whose sum is σ = 28248642. Its totient is φ = 28248640.

The previous prime is 28248637. The next prime is 28248643. The reversal of 28248641 is 14684282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 633616 = 5255^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 28248641 - 2² = 28248637 is a prime.

Together with 28248643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28248643) 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, 14124320 + 14124321.

It is an arithmetic number, because the mean of its divisors is an integer number (14124321).

Almost surely, 2^28248641 is an apocalyptic number.

It is an amenable number.

28248641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28248641 is an equidigital number, since it uses as much as digits as its factorization.

28248641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 35.

The square root of 28248641 is about 5314.9450608638. The cubic root of 28248641 is about 304.5550836273. Note that the first 3 decimals are identical.

The spelling of 28248641 in words is "twenty-eight million, two hundred forty-eight thousand, six hundred forty-one".