217329930 has 48 divisors (see below), whose sum is σ = 578849544. Its totient is φ = 56540160.

The previous prime is 217329929. The next prime is 217329941. The reversal of 217329930 is 39923712.

It can be written as a sum of positive squares in 4 ways, for example, as 73977201 + 143352729 = 8601^2 + 11973^2 .

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, 25759 + ... + 33138.

Almost surely, 2^217329930 is an apocalyptic number.

217329930 is an abundant number, since it is smaller than the sum of its proper divisors (361519614).

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

217329930 is a wasteful number, since it uses less digits than its factorization.

217329930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58951 (or 58948 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 217329930 is about 14742.1141631721. The cubic root of 217329930 is about 601.2288979646.

The spelling of 217329930 in words is "two hundred seventeen million, three hundred twenty-nine thousand, nine hundred thirty".