9988759664 has 20 divisors (see below), whose sum is σ = 20841931656. Its totient is φ = 4610196672.

The previous prime is 9988759621. The next prime is 9988759727. The reversal of 9988759664 is 4669578899.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24011234 + ... + 24011649.

Almost surely, 2^9988759664 is an apocalyptic number.

It is an amenable number.

9988759664 is an abundant number, since it is smaller than the sum of its proper divisors (10853171992).

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

9988759664 is a wasteful number, since it uses less digits than its factorization.

9988759664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48022904 (or 48022898 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 71.

The square root of 9988759664 is about 99943.7825179736. The cubic root of 9988759664 is about 2153.6271684023.

The spelling of 9988759664 in words is "nine billion, nine hundred eighty-eight million, seven hundred fifty-nine thousand, six hundred sixty-four".