28212617 has 2 divisors, whose sum is σ = 28212618. Its totient is φ = 28212616.

The previous prime is 28212557. The next prime is 28212623. The reversal of 28212617 is 71621282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26512201 + 1700416 = 5149^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 28212617 - 2²⁴ = 11435401 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28212617.

It is not a weakly prime, because it can be changed into another prime (28212637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106308 + 14106309.

It is an arithmetic number, because the mean of its divisors is an integer number (14106309).

Almost surely, 2^28212617 is an apocalyptic number.

It is an amenable number.

28212617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28212617 is an equidigital number, since it uses as much as digits as its factorization.

28212617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 28212617 is about 5311.5550453704. Note that the first 3 decimals coincide. The cubic root of 28212617 is about 304.4255675520.

Adding to 28212617 its reverse (71621282), we get a palindrome (99833899).

The spelling of 28212617 in words is "twenty-eight million, two hundred twelve thousand, six hundred seventeen".