8217138792 has 32 divisors (see below), whose sum is σ = 21436015680. Its totient is φ = 2619957120.

The previous prime is 8217138781. The next prime is 8217138799. The reversal of 8217138792 is 2978317128.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (8217138799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7442509 + ... + 7443612.

It is an arithmetic number, because the mean of its divisors is an integer number (669875490).

Almost surely, 2^8217138792 is an apocalyptic number.

It is an amenable number.

8217138792 is an abundant number, since it is smaller than the sum of its proper divisors (13218876888).

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

8217138792 is a wasteful number, since it uses less digits than its factorization.

8217138792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14886153 (or 14886149 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 8217138792 is about 90648.4351326596. The cubic root of 8217138792 is about 2017.9336114806.

The spelling of 8217138792 in words is "eight billion, two hundred seventeen million, one hundred thirty-eight thousand, seven hundred ninety-two".