217642230 has 48 divisors (see below), whose sum is σ = 609401520. Its totient is φ = 53573184.

The previous prime is 217642213. The next prime is 217642241. The reversal of 217642230 is 32246712.

217642230 is a `hidden beast` number, since 2 + 17 + 642 + 2 + 3 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 217642194 and 217642203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91840 + ... + 94179.

It is an arithmetic number, because the mean of its divisors is an integer number (12695865).

Almost surely, 2^217642230 is an apocalyptic number.

217642230 is an abundant number, since it is smaller than the sum of its proper divisors (391759290).

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

217642230 is a wasteful number, since it uses less digits than its factorization.

217642230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186045 (or 186042 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 217642230 is about 14752.7024642945. The cubic root of 217642230 is about 601.5167459056.

Adding to 217642230 its reverse (32246712), we get a palindrome (249888942).

The spelling of 217642230 in words is "two hundred seventeen million, six hundred forty-two thousand, two hundred thirty".