2218311732 has 144 divisors (see below), whose sum is σ = 6708562560. Its totient is φ = 564818688.

The previous prime is 2218311713. The next prime is 2218311743. The reversal of 2218311732 is 2371138122.

It is a self number, because there is not a number n which added to its sum of digits gives 2218311732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216673 + ... + 226679.

It is an arithmetic number, because the mean of its divisors is an integer number (46587240).

Almost surely, 2^2218311732 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 2218311732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3354281280).

2218311732 is an abundant number, since it is smaller than the sum of its proper divisors (4490250828).

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

2218311732 is a wasteful number, since it uses less digits than its factorization.

2218311732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10070 (or 10061 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 2218311732 is about 47098.9568037340. The cubic root of 2218311732 is about 1304.1899783743.

Adding to 2218311732 its reverse (2371138122), we get a palindrome (4589449854).

The spelling of 2218311732 in words is "two billion, two hundred eighteen million, three hundred eleven thousand, seven hundred thirty-two".