217238180 has 12 divisors (see below), whose sum is σ = 456200220. Its totient is φ = 86895264.

The previous prime is 217238179. The next prime is 217238209. The reversal of 217238180 is 81832712.

217238180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 56911936 + 160326244 = 7544^2 + 12662^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5430935 + ... + 5430974.

It is an arithmetic number, because the mean of its divisors is an integer number (38016685).

Almost surely, 2^217238180 is an apocalyptic number.

217238180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217238180 is an abundant number, since it is smaller than the sum of its proper divisors (238962040).

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

217238180 is a wasteful number, since it uses less digits than its factorization.

217238180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10861918 (or 10861916 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 217238180 is about 14739.0020014925. The cubic root of 217238180 is about 601.1442792839.

The spelling of 217238180 in words is "two hundred seventeen million, two hundred thirty-eight thousand, one hundred eighty".