217207064 has 16 divisors (see below), whose sum is σ = 407527200. Its totient is φ = 108533152.

The previous prime is 217207063. The next prime is 217207127. The reversal of 217207064 is 460702712.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5729 + ... + 21615.

It is an arithmetic number, because the mean of its divisors is an integer number (25470450).

Almost surely, 2^217207064 is an apocalyptic number.

It is an amenable number.

217207064 is a deficient number, since it is larger than the sum of its proper divisors (190320136).

217207064 is a wasteful number, since it uses less digits than its factorization.

217207064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17602 (or 17598 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 217207064 is about 14737.9463969713. The cubic root of 217207064 is about 601.1155763819.

Adding to 217207064 its reverse (460702712), we get a palindrome (677909776).

The spelling of 217207064 in words is "two hundred seventeen million, two hundred seven thousand, sixty-four".