218678180 has 72 divisors (see below), whose sum is σ = 537098688. Its totient is φ = 74569152.

The previous prime is 218678179. The next prime is 218678197. The reversal of 218678180 is 81876812.

It is a super-2 number, since 2×218678180² = 95640292816224800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221969 + ... + 222951.

It is an arithmetic number, because the mean of its divisors is an integer number (7459704).

Almost surely, 2^218678180 is an apocalyptic number.

218678180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218678180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268549344).

218678180 is an abundant number, since it is smaller than the sum of its proper divisors (318420508).

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

218678180 is a wasteful number, since it uses less digits than its factorization.

218678180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 218678180 is about 14787.7712992864. The cubic root of 218678180 is about 602.4696173335.

The spelling of 218678180 in words is "two hundred eighteen million, six hundred seventy-eight thousand, one hundred eighty".