1116643220 has 96 divisors (see below), whose sum is σ = 2978954496. Its totient is φ = 341452800.

The previous prime is 1116643207. The next prime is 1116643223. The reversal of 1116643220 is 223466111.

It is a self number, because there is not a number n which added to its sum of digits gives 1116643220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116643223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74780 + ... + 88460.

It is an arithmetic number, because the mean of its divisors is an integer number (31030776).

Almost surely, 2^1116643220 is an apocalyptic number.

1116643220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1116643220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1489477248).

1116643220 is an abundant number, since it is smaller than the sum of its proper divisors (1862311276).

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

1116643220 is a wasteful number, since it uses less digits than its factorization.

1116643220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761 (or 13759 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1116643220 is about 33416.2119337306. The cubic root of 1116643220 is about 1037.4602785393.

The spelling of 1116643220 in words is "one billion, one hundred sixteen million, six hundred forty-three thousand, two hundred twenty".