216864508 has 12 divisors (see below), whose sum is σ = 433729072. Its totient is φ = 92941920.

The previous prime is 216864481. The next prime is 216864541. The reversal of 216864508 is 805468612.

216864508 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3872553 + ... + 3872608.

Almost surely, 2^216864508 is an apocalyptic number.

216864508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216864508 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216864508 is a wasteful number, since it uses less digits than its factorization.

216864508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745172 (or 7745170 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 216864508 is about 14726.3202464159. The cubic root of 216864508 is about 600.7994048173.

The spelling of 216864508 in words is "two hundred sixteen million, eight hundred sixty-four thousand, five hundred eight".