161291760 has 320 divisors, whose sum is σ = 624721920. Its totient is φ = 33592320.

The previous prime is 161291737. The next prime is 161291761. The reversal of 161291760 is 67192161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161291761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 989439 + ... + 989601.

It is an arithmetic number, because the mean of its divisors is an integer number (1952256).

Almost surely, 2^161291760 is an apocalyptic number.

161291760 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 161291760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312360960).

161291760 is an abundant number, since it is smaller than the sum of its proper divisors (463430160).

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

161291760 is a wasteful number, since it uses less digits than its factorization.

161291760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 161291760 is about 12700.0692911496. The cubic root of 161291760 is about 544.3405991338.

The spelling of 161291760 in words is "one hundred sixty-one million, two hundred ninety-one thousand, seven hundred sixty".