28041217 has 2 divisors, whose sum is σ = 28041218. Its totient is φ = 28041216.

The previous prime is 28041199. The next prime is 28041257. The reversal of 28041217 is 71214082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 2143296 = 5089^2 + 1464^2 .

It is a cyclic number.

It is not a de Polignac number, because 28041217 - 2¹¹ = 28039169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28041191 and 28041200.

It is not a weakly prime, because it can be changed into another prime (28041257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14020608 + 14020609.

It is an arithmetic number, because the mean of its divisors is an integer number (14020609).

It is a Proth number, since it is equal to 3423 ⋅ 2¹³ + 1 and 3423 < 2¹³.

Almost surely, 2^28041217 is an apocalyptic number.

It is an amenable number.

28041217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28041217 is an equidigital number, since it uses as much as digits as its factorization.

28041217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 28041217 is about 5295.3958303417. The cubic root of 28041217 is about 303.8078230506.

Adding to 28041217 its reverse (71214082), we get a palindrome (99255299).

The spelling of 28041217 in words is "twenty-eight million, forty-one thousand, two hundred seventeen".