9662791644 has 120 divisors (see below), whose sum is σ = 27643478016. Its totient is φ = 2918916000.

The previous prime is 9662791637. The next prime is 9662791709. The reversal of 9662791644 is 4461972669.

It is a happy number.

9662791644 is a `hidden beast` number, since 9 + 6 + 627 + 9 + 1 + 6 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1175589 + ... + 1183779.

Almost surely, 2^9662791644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9662791644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13821739008).

9662791644 is an abundant number, since it is smaller than the sum of its proper divisors (17980686372).

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

9662791644 is a wasteful number, since it uses less digits than its factorization.

9662791644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8549 (or 8538 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 9662791644 is about 98299.4997138846. The cubic root of 9662791644 is about 2129.9408275567.

The spelling of 9662791644 in words is "nine billion, six hundred sixty-two million, seven hundred ninety-one thousand, six hundred forty-four".