217228338 has 32 divisors (see below), whose sum is σ = 489942720. Its totient is φ = 71327520.

The previous prime is 217228321. The next prime is 217228343. The reversal of 217228338 is 833822712.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26403 + ... + 33638.

It is an arithmetic number, because the mean of its divisors is an integer number (15310710).

Almost surely, 2^217228338 is an apocalyptic number.

217228338 is an abundant number, since it is smaller than the sum of its proper divisors (272714382).

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

217228338 is a wasteful number, since it uses less digits than its factorization.

217228338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60119 (or 60113 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 217228338 is about 14738.6681216452. The cubic root of 217228338 is about 601.1352008439.

The spelling of 217228338 in words is "two hundred seventeen million, two hundred twenty-eight thousand, three hundred thirty-eight".