218915872 has 48 divisors (see below), whose sum is σ = 518495040. Its totient is φ = 88881408.

The previous prime is 218915861. The next prime is 218915887. The reversal of 218915872 is 278519812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21463 + ... + 29974.

It is an arithmetic number, because the mean of its divisors is an integer number (10801980).

Almost surely, 2^218915872 is an apocalyptic number.

It is an amenable number.

218915872 is an abundant number, since it is smaller than the sum of its proper divisors (299579168).

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

218915872 is a wasteful number, since it uses less digits than its factorization.

218915872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51473 (or 51465 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 218915872 is about 14795.8058922115. The cubic root of 218915872 is about 602.6878228492.

The spelling of 218915872 in words is "two hundred eighteen million, nine hundred fifteen thousand, eight hundred seventy-two".