216320540 has 12 divisors (see below), whose sum is σ = 454273176. Its totient is φ = 86528208.

The previous prime is 216320539. The next prime is 216320549. The reversal of 216320540 is 45023612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216320549) 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 3 ways as a sum of consecutive naturals, for example, 5407994 + ... + 5408033.

It is an arithmetic number, because the mean of its divisors is an integer number (37856098).

Almost surely, 2^216320540 is an apocalyptic number.

216320540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216320540 is an abundant number, since it is smaller than the sum of its proper divisors (237952636).

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

216320540 is a wasteful number, since it uses less digits than its factorization.

216320540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10816036 (or 10816034 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 216320540 is about 14707.8394062486. The cubic root of 216320540 is about 600.2966496038.

The spelling of 216320540 in words is "two hundred sixteen million, three hundred twenty thousand, five hundred forty".