161189760 has 128 divisors (see below), whose sum is σ = 527911200. Its totient is φ = 41803776.

The previous prime is 161189729. The next prime is 161189761. The reversal of 161189760 is 67981161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161189761) 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 15 ways as a sum of consecutive naturals, for example, 69906 + ... + 72174.

Almost surely, 2^161189760 is an apocalyptic number.

161189760 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 161189760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263955600).

161189760 is an abundant number, since it is smaller than the sum of its proper divisors (366721440).

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

161189760 is a wasteful number, since it uses less digits than its factorization.

161189760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328 (or 2316 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 161189760 is about 12696.0529299464. The cubic root of 161189760 is about 544.2258289614.

It can be divided in two parts, 16118 and 9760, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 161189760 in words is "one hundred sixty-one million, one hundred eighty-nine thousand, seven hundred sixty".