28008241 has 4 divisors (see below), whose sum is σ = 28050532. Its totient is φ = 27965952.

The previous prime is 28008217. The next prime is 28008247. The reversal of 28008241 is 14280082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14280082 = 2 ⋅7140041.

It can be written as a sum of positive squares in 2 ways, for example, as 21902400 + 6105841 = 4680^2 + 2471^2 .

It is a cyclic number.

It is not a de Polignac number, because 28008241 - 2¹¹ = 28006193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28008247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20136 + ... + 21481.

It is an arithmetic number, because the mean of its divisors is an integer number (7012633).

Almost surely, 2^28008241 is an apocalyptic number.

28008241 is the 3056-th hex number.

It is an amenable number.

28008241 is a deficient number, since it is larger than the sum of its proper divisors (42291).

28008241 is an equidigital number, since it uses as much as digits as its factorization.

28008241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42290.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28008241 is about 5292.2812661460. The cubic root of 28008241 is about 303.6886853721.

The spelling of 28008241 in words is "twenty-eight million, eight thousand, two hundred forty-one".