217064 has 16 divisors (see below), whose sum is σ = 417120. Its totient is φ = 105840.

The previous prime is 217057. The next prime is 217069. The reversal of 217064 is 460712.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (217069) by changing a digit.

217064 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29 + ... + 659.

It is an arithmetic number, because the mean of its divisors is an integer number (26070).

2²¹⁷⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

217064 is a deficient number, since it is larger than the sum of its proper divisors (200056).

217064 is a wasteful number, since it uses less digits than its factorization.

217064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 217064 is about 465.9012770963. The cubic root of 217064 is about 60.0983571948.

Adding to 217064 its reverse (460712), we get a palindrome (677776).

The spelling of 217064 in words is "two hundred seventeen thousand, sixty-four".