216784782 has 64 divisors (see below), whose sum is σ = 515082240. Its totient is φ = 67344768.

The previous prime is 216784751. The next prime is 216784783. The reversal of 216784782 is 287487612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216784783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97123 + ... + 99329.

It is an arithmetic number, because the mean of its divisors is an integer number (8048160).

Almost surely, 2^216784782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216784782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257541120).

216784782 is an abundant number, since it is smaller than the sum of its proper divisors (298297458).

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

216784782 is a wasteful number, since it uses less digits than its factorization.

216784782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342 (or 2336 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 216784782 is about 14723.6130756007. The cubic root of 216784782 is about 600.7257717383.

The spelling of 216784782 in words is "two hundred sixteen million, seven hundred eighty-four thousand, seven hundred eighty-two".