2218918772 has 12 divisors (see below), whose sum is σ = 4437837600. Its totient is φ = 950965176.

The previous prime is 2218918717. The next prime is 2218918783. The reversal of 2218918772 is 2778198122.

2218918772 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39623522 + ... + 39623577.

It is an arithmetic number, because the mean of its divisors is an integer number (369819800).

Almost surely, 2^2218918772 is an apocalyptic number.

It is an amenable number.

2218918772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2218918772 is a wasteful number, since it uses less digits than its factorization.

2218918772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79247110 (or 79247108 counting only the distinct ones).

The product of its digits is 225792, while the sum is 47.

The square root of 2218918772 is about 47105.4006670148. The cubic root of 2218918772 is about 1304.3089311900.

The spelling of 2218918772 in words is "two billion, two hundred eighteen million, nine hundred eighteen thousand, seven hundred seventy-two".