218175380 has 12 divisors (see below), whose sum is σ = 458168340. Its totient is φ = 87270144.

The previous prime is 218175379. The next prime is 218175389. The reversal of 218175380 is 83571812.

It can be written as a sum of positive squares in 2 ways, for example, as 167081476 + 51093904 = 12926^2 + 7148^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218175380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218175389) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5454365 + ... + 5454404.

It is an arithmetic number, because the mean of its divisors is an integer number (38180695).

Almost surely, 2^218175380 is an apocalyptic number.

218175380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218175380 is an abundant number, since it is smaller than the sum of its proper divisors (239992960).

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

218175380 is a wasteful number, since it uses less digits than its factorization.

218175380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10908778 (or 10908776 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 218175380 is about 14770.7609824274. The cubic root of 218175380 is about 602.0075163795.

The spelling of 218175380 in words is "two hundred eighteen million, one hundred seventy-five thousand, three hundred eighty".