120728161 has 8 divisors (see below), whose sum is σ = 121698720. Its totient is φ = 119761248.

The previous prime is 120728143. The next prime is 120728191. The reversal of 120728161 is 161827021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120728161 - 2⁵ = 120728129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120728191) 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, 140445 + ... + 141301.

It is an arithmetic number, because the mean of its divisors is an integer number (15212340).

Almost surely, 2^120728161 is an apocalyptic number.

It is an amenable number.

120728161 is a deficient number, since it is larger than the sum of its proper divisors (970559).

120728161 is an equidigital number, since it uses as much as digits as its factorization.

120728161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 120728161 is about 10987.6367340753. The cubic root of 120728161 is about 494.2380700534.

The spelling of 120728161 in words is "one hundred twenty million, seven hundred twenty-eight thousand, one hundred sixty-one".