218790320 has 80 divisors (see below), whose sum is σ = 611984640. Its totient is φ = 71062272.

The previous prime is 218790269. The next prime is 218790337. The reversal of 218790320 is 23097812.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359 + ... + 20921.

It is an arithmetic number, because the mean of its divisors is an integer number (7649808).

Almost surely, 2^218790320 is an apocalyptic number.

218790320 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 218790320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305992320).

218790320 is an abundant number, since it is smaller than the sum of its proper divisors (393194320).

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

218790320 is a wasteful number, since it uses less digits than its factorization.

218790320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20602 (or 20596 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 218790320 is about 14791.5624597268. The cubic root of 218790320 is about 602.5725835547.

The spelling of 218790320 in words is "two hundred eighteen million, seven hundred ninety thousand, three hundred twenty".