218139568 has 40 divisors (see below), whose sum is σ = 437019152. Its totient is φ = 105401088.

The previous prime is 218139503. The next prime is 218139611. The reversal of 218139568 is 865931812.

218139568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×218139568² = 95169742254453248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91771 + ... + 94117.

Almost surely, 2^218139568 is an apocalyptic number.

It is an amenable number.

218139568 is an abundant number, since it is smaller than the sum of its proper divisors (218879584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218139568 is a wasteful number, since it uses less digits than its factorization.

218139568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549 (or 2543 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 218139568 is about 14769.5486728607. The cubic root of 218139568 is about 601.9745761017.

The spelling of 218139568 in words is "two hundred eighteen million, one hundred thirty-nine thousand, five hundred sixty-eight".