9991600 has 30 divisors (see below), whose sum is σ = 24005780. Its totient is φ = 3996480.

The previous prime is 9991571. The next prime is 9991603. The reversal of 9991600 is 61999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9991603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12090 + ... + 12889.

Almost surely, 2^9991600 is an apocalyptic number.

It is an amenable number.

9991600 is an abundant number, since it is smaller than the sum of its proper divisors (14014180).

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

9991600 is a wasteful number, since it uses less digits than its factorization.

9991600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24997 (or 24986 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 9991600 is about 3160.9492245210. The cubic root of 9991600 is about 215.3831279332.

The spelling of 9991600 in words is "nine million, nine hundred ninety-one thousand, six hundred".