216703812 has 48 divisors (see below), whose sum is σ = 548251200. Its totient is φ = 66223488.

The previous prime is 216703807. The next prime is 216703813. The reversal of 216703812 is 218307612.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 216703812.

It is not an unprimeable number, because it can be changed into a prime (216703813) 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 15 ways as a sum of consecutive naturals, for example, 18583 + ... + 27905.

It is an arithmetic number, because the mean of its divisors is an integer number (11421900).

Almost surely, 2^216703812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216703812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274125600).

216703812 is an abundant number, since it is smaller than the sum of its proper divisors (331547388).

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

216703812 is a wasteful number, since it uses less digits than its factorization.

216703812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492 (or 9490 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 216703812 is about 14720.8631540409. The cubic root of 216703812 is about 600.6509712497.

The spelling of 216703812 in words is "two hundred sixteen million, seven hundred three thousand, eight hundred twelve".