218342728 has 16 divisors (see below), whose sum is σ = 414576000. Its totient is φ = 107789136.

The previous prime is 218342701. The next prime is 218342767. The reversal of 218342728 is 827243812.

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, 172108 + ... + 173371.

It is an arithmetic number, because the mean of its divisors is an integer number (25911000).

Almost surely, 2^218342728 is an apocalyptic number.

It is an amenable number.

218342728 is a deficient number, since it is larger than the sum of its proper divisors (196233272).

218342728 is a wasteful number, since it uses less digits than its factorization.

218342728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345564 (or 345560 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 218342728 is about 14776.4247367217. The cubic root of 218342728 is about 602.1613971803.

The spelling of 218342728 in words is "two hundred eighteen million, three hundred forty-two thousand, seven hundred twenty-eight".