18270216 has 48 divisors (see below), whose sum is σ = 50544000. Its totient is φ = 5959392.

The previous prime is 18270173. The next prime is 18270233. The reversal of 18270216 is 61207281.

It is a self number, because there is not a number n which added to its sum of digits gives 18270216.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685 + ... + 6083.

It is an arithmetic number, because the mean of its divisors is an integer number (1053000).

Almost surely, 2^18270216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18270216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25272000).

18270216 is an abundant number, since it is smaller than the sum of its proper divisors (32273784).

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

18270216 is a wasteful number, since it uses less digits than its factorization.

18270216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5458 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 18270216 is about 4274.3673216045. The cubic root of 18270216 is about 263.3790502621.

Adding to 18270216 its reverse (61207281), we get a palindrome (79477497).

The spelling of 18270216 in words is "eighteen million, two hundred seventy thousand, two hundred sixteen".