218930788 has 12 divisors (see below), whose sum is σ = 383507712. Its totient is φ = 109357160.

The previous prime is 218930779. The next prime is 218930791. The reversal of 218930788 is 887039812.

It is an unprimeable number.

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, 22420 + ... + 30667.

It is an arithmetic number, because the mean of its divisors is an integer number (31958976).

Almost surely, 2^218930788 is an apocalyptic number.

It is an amenable number.

218930788 is a deficient number, since it is larger than the sum of its proper divisors (164576924).

218930788 is a wasteful number, since it uses less digits than its factorization.

218930788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54122 (or 54120 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 218930788 is about 14796.3099453884. The cubic root of 218930788 is about 602.7015107366.

The spelling of 218930788 in words is "two hundred eighteen million, nine hundred thirty thousand, seven hundred eighty-eight".