218484612728 has 8 divisors (see below), whose sum is σ = 409658648880. Its totient is φ = 109242306360.

The previous prime is 218484612719. The next prime is 218484612733. The reversal of 218484612728 is 827216484812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 218484612728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13655288288 + ... + 13655288303.

It is an arithmetic number, because the mean of its divisors is an integer number (51207331110).

Almost surely, 2^218484612728 is an apocalyptic number.

It is an amenable number.

218484612728 is a deficient number, since it is larger than the sum of its proper divisors (191174036152).

218484612728 is a wasteful number, since it uses less digits than its factorization.

218484612728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27310576597 (or 27310576593 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 53.

The spelling of 218484612728 in words is "two hundred eighteen billion, four hundred eighty-four million, six hundred twelve thousand, seven hundred twenty-eight".