216516740 has 24 divisors (see below), whose sum is σ = 496020672. Its totient is φ = 78733280.

The previous prime is 216516691. The next prime is 216516757. The reversal of 216516740 is 47615612.

It is a junction number, because it is equal to n+sod(n) for n = 216516697 and 216516706.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 491864 + ... + 492303.

It is an arithmetic number, because the mean of its divisors is an integer number (20667528).

Almost surely, 2^216516740 is an apocalyptic number.

216516740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216516740 is an abundant number, since it is smaller than the sum of its proper divisors (279503932).

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

216516740 is a wasteful number, since it uses less digits than its factorization.

216516740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984187 (or 984185 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 216516740 is about 14714.5078069231. The cubic root of 216516740 is about 600.4780819246.

The spelling of 216516740 in words is "two hundred sixteen million, five hundred sixteen thousand, seven hundred forty".