161909760 has 176 divisors, whose sum is σ = 528224256. Its totient is φ = 42319872.

The previous prime is 161909729. The next prime is 161909771. The reversal of 161909760 is 67909161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1274817 + ... + 1274943.

Almost surely, 2^161909760 is an apocalyptic number.

161909760 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 161909760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264112128).

161909760 is an abundant number, since it is smaller than the sum of its proper divisors (366314496).

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

161909760 is a wasteful number, since it uses less digits than its factorization.

161909760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 161909760 is about 12724.3766055552. The cubic root of 161909760 is about 545.0349387022.

The spelling of 161909760 in words is "one hundred sixty-one million, nine hundred nine thousand, seven hundred sixty".