218731472 has 20 divisors (see below), whose sum is σ = 442218720. Its totient is φ = 104610528.

The previous prime is 218731453. The next prime is 218731507. The reversal of 218731472 is 274137812.

218731472 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 296822 + ... + 297557.

It is an arithmetic number, because the mean of its divisors is an integer number (22110936).

Almost surely, 2^218731472 is an apocalyptic number.

It is an amenable number.

218731472 is an abundant number, since it is smaller than the sum of its proper divisors (223487248).

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

218731472 is a wasteful number, since it uses less digits than its factorization.

218731472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594410 (or 594404 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 218731472 is about 14789.5730837641. The cubic root of 218731472 is about 602.5185540908.

The spelling of 218731472 in words is "two hundred eighteen million, seven hundred thirty-one thousand, four hundred seventy-two".