28395217 has 2 divisors, whose sum is σ = 28395218. Its totient is φ = 28395216.

The previous prime is 28395197. The next prime is 28395223. The reversal of 28395217 is 71259382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 10042561 = 4284^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 28395217 - 2¹⁵ = 28362449 is a prime.

It is not a weakly prime, because it can be changed into another prime (28395277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14197608 + 14197609.

It is an arithmetic number, because the mean of its divisors is an integer number (14197609).

Almost surely, 2^28395217 is an apocalyptic number.

It is an amenable number.

28395217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28395217 is an equidigital number, since it uses as much as digits as its factorization.

28395217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 28395217 is about 5328.7162619152. The cubic root of 28395217 is about 305.0809316717.

The spelling of 28395217 in words is "twenty-eight million, three hundred ninety-five thousand, two hundred seventeen".