216709324 has 48 divisors (see below), whose sum is σ = 419973120. Its totient is φ = 97231680.

The previous prime is 216709321. The next prime is 216709327. The reversal of 216709324 is 423907612.

It is an interprime number because it is at equal distance from previous prime (216709321) and next prime (216709327).

It is a super-2 number, since 2×216709324² = 93925862217073952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216709324.

It is not an unprimeable number, because it can be changed into a prime (216709321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291297 + ... + 292039.

It is an arithmetic number, because the mean of its divisors is an integer number (8749440).

Almost surely, 2^216709324 is an apocalyptic number.

It is an amenable number.

216709324 is a deficient number, since it is larger than the sum of its proper divisors (203263796).

216709324 is a wasteful number, since it uses less digits than its factorization.

216709324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 216709324 is about 14721.0503701332. The cubic root of 216709324 is about 600.6560638537.

The spelling of 216709324 in words is "two hundred sixteen million, seven hundred nine thousand, three hundred twenty-four".