217376642 has 12 divisors (see below), whose sum is σ = 379300230. Its totient is φ = 93161376.

The previous prime is 217376641. The next prime is 217376683. The reversal of 217376642 is 246673712.

It can be written as a sum of positive squares in only one way, i.e., 140446201 + 76930441 = 11851^2 + 8771^2 .

It is a junction number, because it is equal to n+sod(n) for n = 217376596 and 217376605.

It is not an unprimeable number, because it can be changed into a prime (217376641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1108967 + ... + 1109162.

Almost surely, 2^217376642 is an apocalyptic number.

217376642 is a deficient number, since it is larger than the sum of its proper divisors (161923588).

217376642 is a wasteful number, since it uses less digits than its factorization.

217376642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218145 (or 2218138 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 217376642 is about 14743.6983826990. The cubic root of 217376642 is about 601.2719700998.

The spelling of 217376642 in words is "two hundred seventeen million, three hundred seventy-six thousand, six hundred forty-two".