9991744 has 28 divisors (see below), whose sum is σ = 22660864. Its totient is φ = 4281984.

The previous prime is 9991727. The next prime is 9991757. The reversal of 9991744 is 4471999.

It is a tau number, because it is divible by the number of its divisors (28).

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 9991744.

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, 10704 + ... + 11599.

Almost surely, 2^9991744 is an apocalyptic number.

It is an amenable number.

9991744 is an abundant number, since it is smaller than the sum of its proper divisors (12669120).

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

9991744 is a wasteful number, since it uses less digits than its factorization.

9991744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22322 (or 22312 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 9991744 is about 3160.9720024069. The cubic root of 9991744 is about 215.3841626364.

The spelling of 9991744 in words is "nine million, nine hundred ninety-one thousand, seven hundred forty-four".