161528180 has 48 divisors (see below), whose sum is σ = 372024576. Its totient is φ = 58423680.

The previous prime is 161528179. The next prime is 161528221. The reversal of 161528180 is 81825161.

It is a super-2 number, since 2×161528180² = 52182705868224800, 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 15 ways as a sum of consecutive naturals, for example, 41477 + ... + 45203.

It is an arithmetic number, because the mean of its divisors is an integer number (7750512).

Almost surely, 2^161528180 is an apocalyptic number.

161528180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161528180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186012288).

161528180 is an abundant number, since it is smaller than the sum of its proper divisors (210496396).

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

161528180 is a wasteful number, since it uses less digits than its factorization.

161528180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944 (or 3942 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 161528180 is about 12709.3737060486. The cubic root of 161528180 is about 544.6064324630.

The spelling of 161528180 in words is "one hundred sixty-one million, five hundred twenty-eight thousand, one hundred eighty".