161944320 has 144 divisors (see below), whose sum is σ = 522299232. Its totient is φ = 42762240.

The previous prime is 161944271. The next prime is 161944327. The reversal of 161944320 is 23449161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161944327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694924 + ... + 695156.

It is an arithmetic number, because the mean of its divisors is an integer number (3627078).

Almost surely, 2^161944320 is an apocalyptic number.

161944320 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 161944320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261149616).

161944320 is an abundant number, since it is smaller than the sum of its proper divisors (360354912).

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

161944320 is a wasteful number, since it uses less digits than its factorization.

161944320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 161944320 is about 12725.7345564018. The cubic root of 161944320 is about 545.0737155851.

The spelling of 161944320 in words is "one hundred sixty-one million, nine hundred forty-four thousand, three hundred twenty".