217901438746428 has 48 divisors (see below), whose sum is σ = 526522127989536. Its totient is φ = 70095111740160.

The previous prime is 217901438746423. The next prime is 217901438746447. The reversal of 217901438746428 is 824647834109712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217901438746423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2808258951 + ... + 2808336542.

It is an arithmetic number, because the mean of its divisors is an integer number (10969210999782).

Almost surely, 2^{217901438746428} is an apocalyptic number.

It is an amenable number.

217901438746428 is an abundant number, since it is smaller than the sum of its proper divisors (308620689243108).

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

217901438746428 is a wasteful number, since it uses less digits than its factorization.

217901438746428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5616595614 (or 5616595612 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 66.

The spelling of 217901438746428 in words is "two hundred seventeen trillion, nine hundred one billion, four hundred thirty-eight million, seven hundred forty-six thousand, four hundred twenty-eight".