820783218 has 16 divisors (see below), whose sum is σ = 1694520576. Its totient is φ = 264768720.

The previous prime is 820783211. The next prime is 820783309. The reversal of 820783218 is 812387028.

It is not an unprimeable number, because it can be changed into a prime (820783211) 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, 2206221 + ... + 2206592.

It is an arithmetic number, because the mean of its divisors is an integer number (105907536).

Almost surely, 2^820783218 is an apocalyptic number.

820783218 is an abundant number, since it is smaller than the sum of its proper divisors (873737358).

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

820783218 is a wasteful number, since it uses less digits than its factorization.

820783218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4412849.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 820783218 is about 28649.3144420595. The cubic root of 820783218 is about 936.2880692517.

The spelling of 820783218 in words is "eight hundred twenty million, seven hundred eighty-three thousand, two hundred eighteen".