161727800 has 96 divisors (see below), whose sum is σ = 428878800. Its totient is φ = 56186880.

The previous prime is 161727793. The next prime is 161727803. The reversal of 161727800 is 8727161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161727803) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 42371 + ... + 46029.

Almost surely, 2^161727800 is an apocalyptic number.

161727800 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 161727800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214439400).

161727800 is an abundant number, since it is smaller than the sum of its proper divisors (267151000).

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

161727800 is a wasteful number, since it uses less digits than its factorization.

161727800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705 (or 3696 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 161727800 is about 12717.2245399694. The cubic root of 161727800 is about 544.8306855581.

The spelling of 161727800 in words is "one hundred sixty-one million, seven hundred twenty-seven thousand, eight hundred".