991488000 has 192 divisors, whose sum is σ = 3301421760. Its totient is φ = 264192000.

The previous prime is 991487951. The next prime is 991488007. The reversal of 991488000 is 884199.

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 991488000.

It is not an unprimeable number, because it can be changed into a prime (991488007) 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 15 ways as a sum of consecutive naturals, for example, 767355 + ... + 768645.

It is an arithmetic number, because the mean of its divisors is an integer number (17194905).

Almost surely, 2^991488000 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 991488000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1650710880).

991488000 is an abundant number, since it is smaller than the sum of its proper divisors (2309933760).

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

991488000 is a wasteful number, since it uses less digits than its factorization.

991488000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331 (or 1301 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 991488000 is about 31487.9024388733. The cubic root of 991488000 is about 997.1545779191.

The spelling of 991488000 in words is "nine hundred ninety-one million, four hundred eighty-eight thousand".