216500320 has 48 divisors (see below), whose sum is σ = 525320208. Its totient is φ = 84257280.

The previous prime is 216500279. The next prime is 216500353. The reversal of 216500320 is 23005612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12366 + ... + 24205.

It is an arithmetic number, because the mean of its divisors is an integer number (10944171).

Almost surely, 2^216500320 is an apocalyptic number.

216500320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216500320 is an abundant number, since it is smaller than the sum of its proper divisors (308819888).

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

216500320 is a wasteful number, since it uses less digits than its factorization.

216500320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36623 (or 36615 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 216500320 is about 14713.9498436008. The cubic root of 216500320 is about 600.4629020369.

Adding to 216500320 its reverse (23005612), we get a palindrome (239505932).

The spelling of 216500320 in words is "two hundred sixteen million, five hundred thousand, three hundred twenty".