216540808 has 32 divisors (see below), whose sum is σ = 443576160. Its totient is φ = 98282880.

The previous prime is 216540769. The next prime is 216540809. The reversal of 216540808 is 808045612.

It is not an unprimeable number, because it can be changed into a prime (216540809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78460 + ... + 81172.

It is an arithmetic number, because the mean of its divisors is an integer number (13861755).

Almost surely, 2^216540808 is an apocalyptic number.

It is an amenable number.

216540808 is an abundant number, since it is smaller than the sum of its proper divisors (227035352).

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

216540808 is a wasteful number, since it uses less digits than its factorization.

216540808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637 (or 3633 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 216540808 is about 14715.3256165129. The cubic root of 216540808 is about 600.5003308140.

The spelling of 216540808 in words is "two hundred sixteen million, five hundred forty thousand, eight hundred eight".