216289720 has 16 divisors (see below), whose sum is σ = 486651960. Its totient is φ = 86515872.

The previous prime is 216289663. The next prime is 216289721. The reversal of 216289720 is 27982612.

It is a self number, because there is not a number n which added to its sum of digits gives 216289720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216289721) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2703582 + ... + 2703661.

Almost surely, 2^216289720 is an apocalyptic number.

216289720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216289720 is an abundant number, since it is smaller than the sum of its proper divisors (270362240).

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

216289720 is a wasteful number, since it uses less digits than its factorization.

216289720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407254 (or 5407250 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 216289720 is about 14706.7916283600. The cubic root of 216289720 is about 600.2681394102.

The spelling of 216289720 in words is "two hundred sixteen million, two hundred eighty-nine thousand, seven hundred twenty".