216285740 has 96 divisors (see below), whose sum is σ = 531014400. Its totient is φ = 73163520.

The previous prime is 216285703. The next prime is 216285793. The reversal of 216285740 is 47582612.

It is a self number, because there is not a number n which added to its sum of digits gives 216285740.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246182 + ... + 247058.

It is an arithmetic number, because the mean of its divisors is an integer number (5531400).

Almost surely, 2^216285740 is an apocalyptic number.

216285740 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 216285740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265507200).

216285740 is an abundant number, since it is smaller than the sum of its proper divisors (314728660).

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

216285740 is a wasteful number, since it uses less digits than its factorization.

216285740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 216285740 is about 14706.6563161039. The cubic root of 216285740 is about 600.2644574940.

The spelling of 216285740 in words is "two hundred sixteen million, two hundred eighty-five thousand, seven hundred forty".