218919928 has 8 divisors (see below), whose sum is σ = 410474880. Its totient is φ = 109459960.

The previous prime is 218919917. The next prime is 218919929. The reversal of 218919928 is 829919812.

218919928 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218919929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13682488 + ... + 13682503.

It is an arithmetic number, because the mean of its divisors is an integer number (51309360).

Almost surely, 2^218919928 is an apocalyptic number.

It is an amenable number.

218919928 is a deficient number, since it is larger than the sum of its proper divisors (191554952).

218919928 is a wasteful number, since it uses less digits than its factorization.

218919928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27364997 (or 27364993 counting only the distinct ones).

The product of its digits is 186624, while the sum is 49.

The square root of 218919928 is about 14795.9429574461. The cubic root of 218919928 is about 602.6915449589.

The spelling of 218919928 in words is "two hundred eighteen million, nine hundred nineteen thousand, nine hundred twenty-eight".