216185320 has 64 divisors (see below), whose sum is σ = 540771840. Its totient is φ = 77241600.

The previous prime is 216185309. The next prime is 216185327. The reversal of 216185320 is 23581612.

It is not an unprimeable number, because it can be changed into a prime (216185327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9415 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (8449560).

Almost surely, 2^216185320 is an apocalyptic number.

216185320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216185320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270385920).

216185320 is an abundant number, since it is smaller than the sum of its proper divisors (324586520).

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

216185320 is a wasteful number, since it uses less digits than its factorization.

216185320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13466 (or 13462 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 216185320 is about 14703.2418194084. The cubic root of 216185320 is about 600.1715435426.

The spelling of 216185320 in words is "two hundred sixteen million, one hundred eighty-five thousand, three hundred twenty".