216516738 has 16 divisors (see below), whose sum is σ = 433224000. Its totient is φ = 72140496.

The previous prime is 216516691. The next prime is 216516757. The reversal of 216516738 is 837615612.

It is a junction number, because it is equal to n+sod(n) for n = 216516696 and 216516705.

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, 9931 + ... + 23057.

It is an arithmetic number, because the mean of its divisors is an integer number (27076500).

Almost surely, 2^216516738 is an apocalyptic number.

216516738 is an abundant number, since it is smaller than the sum of its proper divisors (216707262).

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

216516738 is a wasteful number, since it uses less digits than its factorization.

216516738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15881.

The product of its digits is 60480, while the sum is 39.

The square root of 216516738 is about 14714.5077389629. The cubic root of 216516738 is about 600.4780800757.

The spelling of 216516738 in words is "two hundred sixteen million, five hundred sixteen thousand, seven hundred thirty-eight".