159991728 has 80 divisors (see below), whose sum is σ = 449242080. Its totient is φ = 48771072.

The previous prime is 159991697. The next prime is 159991729. The reversal of 159991728 is 827199951.

It is not an unprimeable number, because it can be changed into a prime (159991729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69378 + ... + 71646.

It is an arithmetic number, because the mean of its divisors is an integer number (5615526).

Almost surely, 2^159991728 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 159991728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224621040).

159991728 is an abundant number, since it is smaller than the sum of its proper divisors (289250352).

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

159991728 is a wasteful number, since it uses less digits than its factorization.

159991728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406 (or 2400 counting only the distinct ones).

The product of its digits is 408240, while the sum is 51.

The square root of 159991728 is about 12648.7836569371. The cubic root of 159991728 is about 542.8741674650.

The spelling of 159991728 in words is "one hundred fifty-nine million, nine hundred ninety-one thousand, seven hundred twenty-eight".