216841688 has 32 divisors (see below), whose sum is σ = 466041600. Its totient is φ = 92656032.

The previous prime is 216841633. The next prime is 216841747. The reversal of 216841688 is 886148612.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its 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 7 ways as a sum of consecutive naturals, for example, 13853 + ... + 25011.

It is an arithmetic number, because the mean of its divisors is an integer number (14563800).

Almost surely, 2^216841688 is an apocalyptic number.

216841688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216841688 is an abundant number, since it is smaller than the sum of its proper divisors (249199912).

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

216841688 is a wasteful number, since it uses less digits than its factorization.

216841688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11519 (or 11515 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 216841688 is about 14725.5454228358. The cubic root of 216841688 is about 600.7783306398.

The spelling of 216841688 in words is "two hundred sixteen million, eight hundred forty-one thousand, six hundred eighty-eight".