216873720 has 128 divisors (see below), whose sum is σ = 826214400. Its totient is φ = 49569408.

The previous prime is 216873719. The next prime is 216873773. The reversal of 216873720 is 27378612.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 31 ways as a sum of consecutive naturals, for example, 6784 + ... + 21903.

It is an arithmetic number, because the mean of its divisors is an integer number (6454800).

Almost surely, 2^216873720 is an apocalyptic number.

216873720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216873720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413107200).

216873720 is an abundant number, since it is smaller than the sum of its proper divisors (609340680).

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

216873720 is a wasteful number, since it uses less digits than its factorization.

216873720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28714 (or 28704 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 216873720 is about 14726.6330164094. The cubic root of 216873720 is about 600.8079116430.

The spelling of 216873720 in words is "two hundred sixteen million, eight hundred seventy-three thousand, seven hundred twenty".