161545728 has 40 divisors (see below), whose sum is σ = 430372008. Its totient is φ = 53848064.

The previous prime is 161545697. The next prime is 161545753. The reversal of 161545728 is 827545161.

It is a congruent number.

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, 51051 + ... + 54122.

Almost surely, 2^161545728 is an apocalyptic number.

It is an amenable number.

161545728 is an abundant number, since it is smaller than the sum of its proper divisors (268826280).

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

161545728 is an equidigital number, since it uses as much as digits as its factorization.

161545728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105194 (or 105178 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 161545728 is about 12710.0640438984. The cubic root of 161545728 is about 544.6261532895.

The spelling of 161545728 in words is "one hundred sixty-one million, five hundred forty-five thousand, seven hundred twenty-eight".