8217768447 has 12 divisors (see below), whose sum is σ = 13565840080. Its totient is φ = 4695867648.

The previous prime is 8217768409. The next prime is 8217768473. The reversal of 8217768447 is 7448677128.

It is not a de Polignac number, because 8217768447 - 2²² = 8213574143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8217768393 and 8217768402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8217768847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65220322 + ... + 65220447.

Almost surely, 2^8217768447 is an apocalyptic number.

8217768447 is a deficient number, since it is larger than the sum of its proper divisors (5348071633).

8217768447 is a wasteful number, since it uses less digits than its factorization.

8217768447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130440782 (or 130440779 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 54.

The square root of 8217768447 is about 90651.9081266357. The cubic root of 8217768447 is about 2017.9851529221.

The spelling of 8217768447 in words is "eight billion, two hundred seventeen million, seven hundred sixty-eight thousand, four hundred forty-seven".