215640116 has 12 divisors (see below), whose sum is σ = 377616288. Its totient is φ = 107749752.

The previous prime is 215640097. The next prime is 215640119. The reversal of 215640116 is 611046512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215640119) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10346 + ... + 23201.

It is an arithmetic number, because the mean of its divisors is an integer number (31468024).

Almost surely, 2^215640116 is an apocalyptic number.

It is an amenable number.

215640116 is a deficient number, since it is larger than the sum of its proper divisors (161976172).

215640116 is a wasteful number, since it uses less digits than its factorization.

215640116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35158 (or 35156 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 215640116 is about 14684.6898503169. The cubic root of 215640116 is about 599.6665888367. Note that the first 3 decimals are identical.

Adding to 215640116 its reverse (611046512), we get a palindrome (826686628).

The spelling of 215640116 in words is "two hundred fifteen million, six hundred forty thousand, one hundred sixteen".