191105728 has 56 divisors (see below), whose sum is σ = 415411920. Its totient is φ = 86507520.

The previous prime is 191105723. The next prime is 191105729. The reversal of 191105728 is 827501191.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 191105693 and 191105702.

It is not an unprimeable number, because it can be changed into a prime (191105723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248128 + ... + 248896.

It is an arithmetic number, because the mean of its divisors is an integer number (7418070).

Almost surely, 2^191105728 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 191105728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207705960).

191105728 is an abundant number, since it is smaller than the sum of its proper divisors (224306192).

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

191105728 is a wasteful number, since it uses less digits than its factorization.

191105728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 191105728 is about 13824.0995366787. The cubic root of 191105728 is about 576.0027649044.

The spelling of 191105728 in words is "one hundred ninety-one million, one hundred five thousand, seven hundred twenty-eight".