217630230 has 64 divisors (see below), whose sum is σ = 541956096. Its totient is φ = 55872000.

The previous prime is 217630229. The next prime is 217630241. The reversal of 217630230 is 32036712.

217630230 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 217630230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223645 + ... + 224615.

It is an arithmetic number, because the mean of its divisors is an integer number (8468064).

Almost surely, 2^217630230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217630230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270978048).

217630230 is an abundant number, since it is smaller than the sum of its proper divisors (324325866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217630230 is a wasteful number, since it uses less digits than its factorization.

217630230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 217630230 is about 14752.2957535429. The cubic root of 217630230 is about 601.5056905548.

Adding to 217630230 its reverse (32036712), we get a palindrome (249666942).

The spelling of 217630230 in words is "two hundred seventeen million, six hundred thirty thousand, two hundred thirty".