217505052 has 54 divisors (see below), whose sum is σ = 568202544. Its totient is φ = 70151760.

The previous prime is 217505047. The next prime is 217505059. The reversal of 217505052 is 250505712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217505059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31453 + ... + 37739.

Almost surely, 2^217505052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217505052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284101272).

217505052 is an abundant number, since it is smaller than the sum of its proper divisors (350697492).

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

217505052 is a wasteful number, since it uses less digits than its factorization.

217505052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359 (or 6323 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 217505052 is about 14748.0524815991. The cubic root of 217505052 is about 601.3903424247.

The spelling of 217505052 in words is "two hundred seventeen million, five hundred five thousand, fifty-two".