161576728 has 16 divisors (see below), whose sum is σ = 303665760. Its totient is φ = 80599200.

The previous prime is 161576717. The next prime is 161576747. The reversal of 161576728 is 827675161.

161576728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161576728² = 52214078062371968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19983 + ... + 26878.

It is an arithmetic number, because the mean of its divisors is an integer number (18979110).

Almost surely, 2^161576728 is an apocalyptic number.

It is an amenable number.

161576728 is a deficient number, since it is larger than the sum of its proper divisors (142089032).

161576728 is a wasteful number, since it uses less digits than its factorization.

161576728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47298 (or 47294 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 161576728 is about 12711.2834914496. The cubic root of 161576728 is about 544.6609882784.

The spelling of 161576728 in words is "one hundred sixty-one million, five hundred seventy-six thousand, seven hundred twenty-eight".