161380320 has 96 divisors (see below), whose sum is σ = 538278048. Its totient is φ = 40501248.

The previous prime is 161380313. The next prime is 161380361. The reversal of 161380320 is 23083161.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 1729 + ... + 18048.

It is an arithmetic number, because the mean of its divisors is an integer number (5607063).

Almost surely, 2^161380320 is an apocalyptic number.

161380320 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 161380320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269139024).

161380320 is an abundant number, since it is smaller than the sum of its proper divisors (376897728).

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

161380320 is a wasteful number, since it uses less digits than its factorization.

161380320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19812 (or 19804 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 161380320 is about 12703.5554078376. Note that the first 3 decimals coincide. The cubic root of 161380320 is about 544.4402074115.

The spelling of 161380320 in words is "one hundred sixty-one million, three hundred eighty thousand, three hundred twenty".