161727980 has 12 divisors (see below), whose sum is σ = 339628800. Its totient is φ = 64691184.

The previous prime is 161727971. The next prime is 161727997. The reversal of 161727980 is 89727161.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4043180 + ... + 4043219.

It is an arithmetic number, because the mean of its divisors is an integer number (28302400).

Almost surely, 2^161727980 is an apocalyptic number.

161727980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161727980 is an abundant number, since it is smaller than the sum of its proper divisors (177900820).

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

161727980 is a wasteful number, since it uses less digits than its factorization.

161727980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8086408 (or 8086406 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 161727980 is about 12717.2316169833. The cubic root of 161727980 is about 544.8308876868.

The spelling of 161727980 in words is "one hundred sixty-one million, seven hundred twenty-seven thousand, nine hundred eighty".