991726080 has 160 divisors (see below), whose sum is σ = 3196670400. Its totient is φ = 262275072.

The previous prime is 991726069. The next prime is 991726111. The reversal of 991726080 is 80627199.

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

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, 1067056 + ... + 1067984.

It is an arithmetic number, because the mean of its divisors is an integer number (19979190).

Almost surely, 2^991726080 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 991726080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598335200).

991726080 is an abundant number, since it is smaller than the sum of its proper divisors (2204944320).

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

991726080 is a wasteful number, since it uses less digits than its factorization.

991726080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 991726080 is about 31491.6827114716. The cubic root of 991726080 is about 997.2343850919.

The spelling of 991726080 in words is "nine hundred ninety-one million, seven hundred twenty-six thousand, eighty".