218005530 has 16 divisors (see below), whose sum is σ = 523213344. Its totient is φ = 58134800.

The previous prime is 218005507. The next prime is 218005553. The reversal of 218005530 is 35500812.

218005530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (218005507) and next prime (218005553).

It is a super-2 number, since 2×218005530² = 95052822221161800, which contains 22 as substring.

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 218005530.

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 7 ways as a sum of consecutive naturals, for example, 3633396 + ... + 3633455.

It is an arithmetic number, because the mean of its divisors is an integer number (32700834).

Almost surely, 2^218005530 is an apocalyptic number.

218005530 is an abundant number, since it is smaller than the sum of its proper divisors (305207814).

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

218005530 is a wasteful number, since it uses less digits than its factorization.

218005530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266861.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 218005530 is about 14765.0103284759. The cubic root of 218005530 is about 601.8512544427.

The spelling of 218005530 in words is "two hundred eighteen million, five thousand, five hundred thirty".