818113220 has 48 divisors (see below), whose sum is σ = 1808714880. Its totient is φ = 310227456.

The previous prime is 818113217. The next prime is 818113237. The reversal of 818113220 is 22311818.

It is a self number, because there is not a number n which added to its sum of digits gives 818113220.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 44111 + ... + 59849.

It is an arithmetic number, because the mean of its divisors is an integer number (37681560).

Almost surely, 2^818113220 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 818113220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904357440).

818113220 is an abundant number, since it is smaller than the sum of its proper divisors (990601660).

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

818113220 is a wasteful number, since it uses less digits than its factorization.

818113220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15884 (or 15882 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 818113220 is about 28602.6785458985. The cubic root of 818113220 is about 935.2717217647.

The spelling of 818113220 in words is "eight hundred eighteen million, one hundred thirteen thousand, two hundred twenty".