173220320 has 96 divisors (see below), whose sum is σ = 503713728. Its totient is φ = 54816768.

The previous prime is 173220319. The next prime is 173220323. The reversal of 173220320 is 23022371.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 173220292 and 173220301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173220323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8612 + ... + 20508.

It is an arithmetic number, because the mean of its divisors is an integer number (5247018).

Almost surely, 2^173220320 is an apocalyptic number.

173220320 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 173220320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251856864).

173220320 is an abundant number, since it is smaller than the sum of its proper divisors (330493408).

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

173220320 is a wasteful number, since it uses less digits than its factorization.

173220320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11932 (or 11924 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 173220320 is about 13161.3190828275. The cubic root of 173220320 is about 557.4419037640.

Adding to 173220320 its reverse (23022371), we get a palindrome (196242691).

The spelling of 173220320 in words is "one hundred seventy-three million, two hundred twenty thousand, three hundred twenty".