90218 has 8 divisors (see below), whose sum is σ = 137280. Its totient is φ = 44460.

The previous prime is 90217. The next prime is 90227. The reversal of 90218 is 81209.

90218 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90218.

It is not an unprimeable number, because it can be changed into a prime (90217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128 + ... + 443.

It is an arithmetic number, because the mean of its divisors is an integer number (17160).

2⁹⁰²¹⁸ is an apocalyptic number.

90218 is a deficient number, since it is larger than the sum of its proper divisors (47062).

90218 is a wasteful number, since it uses less digits than its factorization.

90218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 90218 is about 300.3631135809. The cubic root of 90218 is about 44.8502014841.

Subtracting from 90218 its reverse (81209), we obtain a palindrome (9009).

The spelling of 90218 in words is "ninety thousand, two hundred eighteen".