215782816 has 48 divisors (see below), whose sum is σ = 450455040. Its totient is φ = 101571840.

The previous prime is 215782811. The next prime is 215782859. The reversal of 215782816 is 618287512.

It is not an unprimeable number, because it can be changed into a prime (215782811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33765 + ... + 39643.

It is an arithmetic number, because the mean of its divisors is an integer number (9384480).

Almost surely, 2^215782816 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 215782816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225227520).

215782816 is an abundant number, since it is smaller than the sum of its proper divisors (234672224).

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

215782816 is a wasteful number, since it uses less digits than its factorization.

215782816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957 (or 5949 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 215782816 is about 14689.5478487256. The cubic root of 215782816 is about 599.7988362665.

The spelling of 215782816 in words is "two hundred fifteen million, seven hundred eighty-two thousand, eight hundred sixteen".