9991504864 has 48 divisors (see below), whose sum is σ = 22039029936. Its totient is φ = 4418841600.

The previous prime is 9991504847. The next prime is 9991504883. The reversal of 9991504864 is 4684051999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370557 + ... + 396604.

It is an arithmetic number, because the mean of its divisors is an integer number (459146457).

Almost surely, 2^9991504864 is an apocalyptic number.

It is an amenable number.

9991504864 is an abundant number, since it is smaller than the sum of its proper divisors (12047525072).

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

9991504864 is a wasteful number, since it uses less digits than its factorization.

9991504864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767219 (or 767211 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 9991504864 is about 99957.5152952493. The cubic root of 9991504864 is about 2153.8244433385.

The spelling of 9991504864 in words is "nine billion, nine hundred ninety-one million, five hundred four thousand, eight hundred sixty-four".