218172168 has 48 divisors (see below), whose sum is σ = 602042220. Its totient is φ = 71350656.

The previous prime is 218172139. The next prime is 218172179. The reversal of 218172168 is 861271812.

It can be written as a sum of positive squares in 2 ways, for example, as 183385764 + 34786404 = 13542^2 + 5898^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24771 + ... + 32402.

Almost surely, 2^218172168 is an apocalyptic number.

It is an amenable number.

218172168 is an abundant number, since it is smaller than the sum of its proper divisors (383870052).

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

218172168 is a wasteful number, since it uses less digits than its factorization.

218172168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57238 (or 57231 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 218172168 is about 14770.6522537090. The cubic root of 218172168 is about 602.0045620931.

The spelling of 218172168 in words is "two hundred eighteen million, one hundred seventy-two thousand, one hundred sixty-eight".