8917978544 has 20 divisors (see below), whose sum is σ = 17281861896. Its totient is φ = 4458143232.

The previous prime is 8917978513. The next prime is 8917978549. The reversal of 8917978544 is 4458797198.

It is a happy number.

It is a super-2 number, since 2×8917978544² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8917978549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38912 + ... + 139104.

Almost surely, 2^8917978544 is an apocalyptic number.

It is an amenable number.

8917978544 is a deficient number, since it is larger than the sum of its proper divisors (8363883352).

8917978544 is a wasteful number, since it uses less digits than its factorization.

8917978544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105764 (or 105758 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 62.

The square root of 8917978544 is about 94435.0493408035. The cubic root of 8917978544 is about 2073.7455847934.

The spelling of 8917978544 in words is "eight billion, nine hundred seventeen million, nine hundred seventy-eight thousand, five hundred forty-four".