218270190 has 16 divisors (see below), whose sum is σ = 523848528. Its totient is φ = 58205376.

The previous prime is 218270179. The next prime is 218270197. The reversal of 218270190 is 91072812.

It is a super-2 number, since 2×218270190² = 95283751685272200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 7275673 = 218270190 / (2 + 1 + 8 + 2 + 7 + 0 + 1 + 9 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218270197) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3637807 + ... + 3637866.

It is an arithmetic number, because the mean of its divisors is an integer number (32740533).

Almost surely, 2^218270190 is an apocalyptic number.

218270190 is an abundant number, since it is smaller than the sum of its proper divisors (305578338).

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

218270190 is a wasteful number, since it uses less digits than its factorization.

218270190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7275683.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 218270190 is about 14773.9700148606. The cubic root of 218270190 is about 602.0947062768.

The spelling of 218270190 in words is "two hundred eighteen million, two hundred seventy thousand, one hundred ninety".