217282638438 has 12 divisors (see below), whose sum is σ = 470779049988. Its totient is φ = 72427546140.

The previous prime is 217282638371. The next prime is 217282638449. The reversal of 217282638438 is 834836282712.

217282638438 is a `hidden beast` number, since 2 + 1 + 72 + 82 + 63 + 8 + 438 = 666.

217282638438 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6035628828 + ... + 6035628863.

It is an arithmetic number, because the mean of its divisors is an integer number (39231587499).

Almost surely, 2^217282638438 is an apocalyptic number.

217282638438 is an abundant number, since it is smaller than the sum of its proper divisors (253496411550).

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

217282638438 is a wasteful number, since it uses less digits than its factorization.

217282638438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12071257699 (or 12071257696 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 217282638438 in words is "two hundred seventeen billion, two hundred eighty-two million, six hundred thirty-eight thousand, four hundred thirty-eight".