216655340 has 36 divisors (see below), whose sum is σ = 500103408. Its totient is φ = 78782880.

The previous prime is 216655333. The next prime is 216655343. The reversal of 216655340 is 43556612.

It is a junction number, because it is equal to n+sod(n) for n = 216655297 and 216655306.

It is not an unprimeable number, because it can be changed into a prime (216655343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42344 + ... + 47183.

Almost surely, 2^216655340 is an apocalyptic number.

216655340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216655340 is an abundant number, since it is smaller than the sum of its proper divisors (283448068).

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

216655340 is a wasteful number, since it uses less digits than its factorization.

216655340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89558 (or 89545 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 216655340 is about 14719.2166911151. The cubic root of 216655340 is about 600.6061836590.

It can be divided in two parts, 216 and 655340, that added together give a palindrome (655556).

The spelling of 216655340 in words is "two hundred sixteen million, six hundred fifty-five thousand, three hundred forty".