1191318058728 has 256 divisors, whose sum is σ = 3947899392000. Its totient is φ = 325453531392.

The previous prime is 1191318058703. The next prime is 1191318058729. The reversal of 1191318058728 is 8278508131911.

1191318058728 is a `hidden beast` number, since 1 + 1 + 9 + 1 + 31 + 8 + 0 + 587 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1191318058729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 126475603 + ... + 126485021.

It is an arithmetic number, because the mean of its divisors is an integer number (15421482000).

Almost surely, 2^{1191318058728} is an apocalyptic number.

1191318058728 is a gapful number since it is divisible by the number (18) 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 1191318058728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1973949696000).

1191318058728 is an abundant number, since it is smaller than the sum of its proper divisors (2756581333272).

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

1191318058728 is a wasteful number, since it uses less digits than its factorization.

1191318058728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13101 (or 13091 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 54.

The spelling of 1191318058728 in words is "one trillion, one hundred ninety-one billion, three hundred eighteen million, fifty-eight thousand, seven hundred twenty-eight".