216775660 has 12 divisors (see below), whose sum is σ = 455228928. Its totient is φ = 86710256.

The previous prime is 216775649. The next prime is 216775661. The reversal of 216775660 is 66577612.

It is a happy number.

216775660 is nontrivially palindromic in base 16.

It is not an unprimeable number, because it can be changed into a prime (216775661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5419372 + ... + 5419411.

It is an arithmetic number, because the mean of its divisors is an integer number (37935744).

Almost surely, 2^216775660 is an apocalyptic number.

216775660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216775660 is an abundant number, since it is smaller than the sum of its proper divisors (238453268).

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

216775660 is a wasteful number, since it uses less digits than its factorization.

216775660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10838792 (or 10838790 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 216775660 is about 14723.3032978337. The cubic root of 216775660 is about 600.7173457204.

The spelling of 216775660 in words is "two hundred sixteen million, seven hundred seventy-five thousand, six hundred sixty".