7817989648 has 40 divisors (see below), whose sum is σ = 18329576832. Its totient is φ = 3153474048.

The previous prime is 7817989643. The next prime is 7817989651. The reversal of 7817989648 is 8469897187.

It is a super-2 number, since 2×7817989648² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7817989643) 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, 2051140 + ... + 2054947.

Almost surely, 2^7817989648 is an apocalyptic number.

It is an amenable number.

7817989648 is an abundant number, since it is smaller than the sum of its proper divisors (10511587184).

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

7817989648 is a wasteful number, since it uses less digits than its factorization.

7817989648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106119 (or 4106113 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 67.

The square root of 7817989648 is about 88419.3963336100. The cubic root of 7817989648 is about 1984.7159673712.

The spelling of 7817989648 in words is "seven billion, eight hundred seventeen million, nine hundred eighty-nine thousand, six hundred forty-eight".