1191268080 has 160 divisors (see below), whose sum is σ = 4319366400. Its totient is φ = 300941568.

The previous prime is 1191268069. The next prime is 1191268109. The reversal of 1191268080 is 808621911.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26527 + ... + 55553.

It is an arithmetic number, because the mean of its divisors is an integer number (26996040).

Almost surely, 2^1191268080 is an apocalyptic number.

1191268080 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 1191268080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2159683200).

1191268080 is an abundant number, since it is smaller than the sum of its proper divisors (3128098320).

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

1191268080 is a wasteful number, since it uses less digits than its factorization.

1191268080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29068 (or 29056 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 1191268080 is about 34514.7516288326. The cubic root of 1191268080 is about 1060.0747781588.

Adding to 1191268080 its reverse (808621911), we get a palindrome (1999889991).

The spelling of 1191268080 in words is "one billion, one hundred ninety-one million, two hundred sixty-eight thousand, eighty".