216704220 has 48 divisors (see below), whose sum is σ = 607436928. Its totient is φ = 57724480.

The previous prime is 216704179. The next prime is 216704233. The reversal of 216704220 is 22407612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84355 + ... + 86885.

It is an arithmetic number, because the mean of its divisors is an integer number (12654936).

Almost surely, 2^216704220 is an apocalyptic number.

216704220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216704220 is an abundant number, since it is smaller than the sum of its proper divisors (390732708).

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

216704220 is a wasteful number, since it uses less digits than its factorization.

216704220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970 (or 3968 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 216704220 is about 14720.8770119175. The cubic root of 216704220 is about 600.6513482089.

The spelling of 216704220 in words is "two hundred sixteen million, seven hundred four thousand, two hundred twenty".