1109991680 has 216 divisors, whose sum is σ = 3157342272. Its totient is φ = 366170112.

The previous prime is 1109991671. The next prime is 1109991683. The reversal of 1109991680 is 861999011.

It is not an unprimeable number, because it can be changed into a prime (1109991683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16567007 + ... + 16567073.

Almost surely, 2^1109991680 is an apocalyptic number.

1109991680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1109991680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1578671136).

1109991680 is an abundant number, since it is smaller than the sum of its proper divisors (2047350592).

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

1109991680 is an frugal number, since it uses more digits than its factorization.

1109991680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 1109991680 is about 33316.5376352345. The cubic root of 1109991680 is about 1035.3962184996.

The spelling of 1109991680 in words is "one billion, one hundred nine million, nine hundred ninety-one thousand, six hundred eighty".