217207065 has 32 divisors (see below), whose sum is σ = 352864512. Its totient is φ = 114080000.

The previous prime is 217207063. The next prime is 217207127. The reversal of 217207065 is 560702712.

It is not a de Polignac number, because 217207065 - 2¹ = 217207063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217207063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470935 + ... + 471395.

It is an arithmetic number, because the mean of its divisors is an integer number (11027016).

Almost surely, 2^217207065 is an apocalyptic number.

It is an amenable number.

217207065 is a deficient number, since it is larger than the sum of its proper divisors (135657447).

217207065 is a wasteful number, since it uses less digits than its factorization.

217207065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 217207065 is about 14737.9464308974. The cubic root of 217207065 is about 601.1155773044.

Adding to 217207065 its reverse (560702712), we get a palindrome (777909777).

The spelling of 217207065 in words is "two hundred seventeen million, two hundred seven thousand, sixty-five".