216539232 has 144 divisors (see below), whose sum is σ = 712282032. Its totient is φ = 57093120.

The previous prime is 216539231. The next prime is 216539261. The reversal of 216539232 is 232935612.

It is a junction number, because it is equal to n+sod(n) for n = 216539193 and 216539202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216539231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59382 + ... + 62922.

It is an arithmetic number, because the mean of its divisors is an integer number (4946403).

Almost surely, 2^216539232 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 216539232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356141016).

216539232 is an abundant number, since it is smaller than the sum of its proper divisors (495742800).

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

216539232 is a wasteful number, since it uses less digits than its factorization.

216539232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581 (or 3566 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 216539232 is about 14715.2720668019. The cubic root of 216539232 is about 600.4988739818.

The spelling of 216539232 in words is "two hundred sixteen million, five hundred thirty-nine thousand, two hundred thirty-two".