161271728 has 20 divisors (see below), whose sum is σ = 312913008. Its totient is φ = 80520000.

The previous prime is 161271727. The next prime is 161271751. The reversal of 161271728 is 827172161.

161271728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161271727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4853 + ... + 18603.

Almost surely, 2^161271728 is an apocalyptic number.

It is an amenable number.

161271728 is a deficient number, since it is larger than the sum of its proper divisors (151641280).

161271728 is a wasteful number, since it uses less digits than its factorization.

161271728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14492 (or 14486 counting only the distinct ones).

The product of its digits is 9408, while the sum is 35.

The square root of 161271728 is about 12699.2806095464. The cubic root of 161271728 is about 544.3180629912.

The spelling of 161271728 in words is "one hundred sixty-one million, two hundred seventy-one thousand, seven hundred twenty-eight".