216685172 has 48 divisors (see below), whose sum is σ = 427932288. Its totient is φ = 95137920.

The previous prime is 216685171. The next prime is 216685199. The reversal of 216685172 is 271586612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216685171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271478 + ... + 272274.

It is an arithmetic number, because the mean of its divisors is an integer number (8915256).

Almost surely, 2^216685172 is an apocalyptic number.

216685172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216685172 is a deficient number, since it is larger than the sum of its proper divisors (211247116).

216685172 is a wasteful number, since it uses less digits than its factorization.

216685172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016 (or 1014 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 216685172 is about 14720.2300253766. The cubic root of 216685172 is about 600.6337488867.

The spelling of 216685172 in words is "two hundred sixteen million, six hundred eighty-five thousand, one hundred seventy-two".