216509736 has 32 divisors (see below), whose sum is σ = 545176800. Its totient is φ = 71649600.

The previous prime is 216509729. The next prime is 216509749. The reversal of 216509736 is 637905612.

It is a junction number, because it is equal to n+sod(n) for n = 216509694 and 216509703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29115 + ... + 35786.

It is an arithmetic number, because the mean of its divisors is an integer number (17036775).

Almost surely, 2^216509736 is an apocalyptic number.

It is an amenable number.

216509736 is an abundant number, since it is smaller than the sum of its proper divisors (328667064).

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

216509736 is a wasteful number, since it uses less digits than its factorization.

216509736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65049 (or 65045 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 216509736 is about 14714.2698085906. The cubic root of 216509736 is about 600.4716069921.

The spelling of 216509736 in words is "two hundred sixteen million, five hundred nine thousand, seven hundred thirty-six".