161286728 has 16 divisors (see below), whose sum is σ = 304341180. Its totient is φ = 80129088.

The previous prime is 161286691. The next prime is 161286731. The reversal of 161286728 is 827682161.

It can be written as a sum of positive squares in 2 ways, for example, as 161239204 + 47524 = 12698^2 + 218^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62951 + ... + 65462.

Almost surely, 2^161286728 is an apocalyptic number.

It is an amenable number.

161286728 is a deficient number, since it is larger than the sum of its proper divisors (143054452).

161286728 is a wasteful number, since it uses less digits than its factorization.

161286728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128576 (or 128572 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 161286728 is about 12699.8711804490. The cubic root of 161286728 is about 544.3349382735.

The spelling of 161286728 in words is "one hundred sixty-one million, two hundred eighty-six thousand, seven hundred twenty-eight".