216539244 has 108 divisors (see below), whose sum is σ = 586366144. Its totient is φ = 69914016.

The previous prime is 216539231. The next prime is 216539261. The reversal of 216539244 is 442935612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (51840) is a multiple of the sum of its prime factors (288).

It is a junction number, because it is equal to n+sod(n) for n = 216539199 and 216539208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 970917 + ... + 971139.

Almost surely, 2^216539244 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 216539244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293183072).

216539244 is an abundant number, since it is smaller than the sum of its proper divisors (369826900).

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

216539244 is an equidigital number, since it uses as much as digits as its factorization.

216539244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 265 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 216539244 is about 14715.2724745415. The cubic root of 216539244 is about 600.4988850745.

The spelling of 216539244 in words is "two hundred sixteen million, five hundred thirty-nine thousand, two hundred forty-four".