218479734 has 64 divisors (see below), whose sum is σ = 542626560. Its totient is φ = 64584000.

The previous prime is 218479717. The next prime is 218479747. The reversal of 218479734 is 437974812.

It is a self number, because there is not a number n which added to its sum of digits gives 218479734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19869 + ... + 28839.

It is an arithmetic number, because the mean of its divisors is an integer number (8478540).

Almost surely, 2^218479734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218479734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271313280).

218479734 is an abundant number, since it is smaller than the sum of its proper divisors (324146826).

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

218479734 is a wasteful number, since it uses less digits than its factorization.

218479734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034 (or 9028 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 218479734 is about 14781.0599755227. The cubic root of 218479734 is about 602.2873192043.

It can be divided in two parts, 2184 and 79734, that added together give a palindrome (81918).

The spelling of 218479734 in words is "two hundred eighteen million, four hundred seventy-nine thousand, seven hundred thirty-four".