216306808 has 8 divisors (see below), whose sum is σ = 405575280. Its totient is φ = 108153400.

The previous prime is 216306787. The next prime is 216306829. The reversal of 216306808 is 808603612.

It is an interprime number because it is at equal distance from previous prime (216306787) and next prime (216306829).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 13519168 + ... + 13519183.

It is an arithmetic number, because the mean of its divisors is an integer number (50696910).

Almost surely, 2^216306808 is an apocalyptic number.

It is an amenable number.

216306808 is a deficient number, since it is larger than the sum of its proper divisors (189268472).

216306808 is a wasteful number, since it uses less digits than its factorization.

216306808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27038357 (or 27038353 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 216306808 is about 14707.3725729649. The cubic root of 216306808 is about 600.2839470837.

The spelling of 216306808 in words is "two hundred sixteen million, three hundred six thousand, eight hundred eight".