216735386 has 16 divisors (see below), whose sum is σ = 384359040. Its totient is φ = 89683440.

The previous prime is 216735347. The next prime is 216735403. The reversal of 216735386 is 683537612.

216735386 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 266510 + ... + 267321.

It is an arithmetic number, because the mean of its divisors is an integer number (24022440).

Almost surely, 2^216735386 is an apocalyptic number.

216735386 is a deficient number, since it is larger than the sum of its proper divisors (167623654).

216735386 is a wasteful number, since it uses less digits than its factorization.

216735386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533869.

The product of its digits is 181440, while the sum is 41.

The square root of 216735386 is about 14721.9355385085. The cubic root of 216735386 is about 600.6801416838.

The spelling of 216735386 in words is "two hundred sixteen million, seven hundred thirty-five thousand, three hundred eighty-six".