218285490 has 64 divisors (see below), whose sum is σ = 556502400. Its totient is φ = 54641664.

The previous prime is 218285489. The next prime is 218285497. The reversal of 218285490 is 94582812.

It is not an unprimeable number, because it can be changed into a prime (218285497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62716 + ... + 66104.

It is an arithmetic number, because the mean of its divisors is an integer number (8695350).

Almost surely, 2^218285490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218285490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278251200).

218285490 is an abundant number, since it is smaller than the sum of its proper divisors (338216910).

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

218285490 is a wasteful number, since it uses less digits than its factorization.

218285490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3531.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 218285490 is about 14774.4878083810. The cubic root of 218285490 is about 602.1087742137.

The spelling of 218285490 in words is "two hundred eighteen million, two hundred eighty-five thousand, four hundred ninety".