991080960 has 160 divisors (see below), whose sum is σ = 3355178112. Its totient is φ = 248709120.

The previous prime is 991080947. The next prime is 991080989. The reversal of 991080960 is 69080199.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

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, 126765 + ... + 134355.

Almost surely, 2^991080960 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 991080960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1677589056).

991080960 is an abundant number, since it is smaller than the sum of its proper divisors (2364097152).

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

991080960 is a wasteful number, since it uses less digits than its factorization.

991080960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7634 (or 7618 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 991080960 is about 31481.4383407112. The cubic root of 991080960 is about 997.0181037998.

The spelling of 991080960 in words is "nine hundred ninety-one million, eighty thousand, nine hundred sixty".