216863788 has 6 divisors (see below), whose sum is σ = 379511636. Its totient is φ = 108431892.

The previous prime is 216863783. The next prime is 216863789. The reversal of 216863788 is 887368612.

It is not an unprimeable number, because it can be changed into a prime (216863783) 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 as a sum of consecutive naturals, namely, 27107970 + ... + 27107977.

Almost surely, 2^216863788 is an apocalyptic number.

It is an amenable number.

216863788 is a deficient number, since it is larger than the sum of its proper divisors (162647848).

216863788 is a wasteful number, since it uses less digits than its factorization.

216863788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54215951 (or 54215949 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 216863788 is about 14726.2958003702. The cubic root of 216863788 is about 600.7987399228.

It can be divided in two parts, 2168 and 63788, that added together give a palindrome (65956).

The spelling of 216863788 in words is "two hundred sixteen million, eight hundred sixty-three thousand, seven hundred eighty-eight".