218764444 has 12 divisors (see below), whose sum is σ = 382950568. Its totient is φ = 109350000.

The previous prime is 218764439. The next prime is 218764453. The reversal of 218764444 is 444467812.

It is a junction number, because it is equal to n+sod(n) for n = 218764397 and 218764406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13819 + ... + 25069.

Almost surely, 2^218764444 is an apocalyptic number.

It is an amenable number.

218764444 is a deficient number, since it is larger than the sum of its proper divisors (164186124).

218764444 is a wasteful number, since it uses less digits than its factorization.

218764444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16116 (or 16114 counting only the distinct ones).

The product of its digits is 172032, while the sum is 40.

The square root of 218764444 is about 14790.6877460110. The cubic root of 218764444 is about 602.5488275024.

The spelling of 218764444 in words is "two hundred eighteen million, seven hundred sixty-four thousand, four hundred forty-four".