172308320 has 48 divisors (see below), whose sum is σ = 414000720. Its totient is φ = 67751424.

The previous prime is 172308317. The next prime is 172308337. The reversal of 172308320 is 23803271.

It is a self number, because there is not a number n which added to its sum of digits gives 172308320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (8625015).

Almost surely, 2^172308320 is an apocalyptic number.

172308320 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 172308320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207000360).

172308320 is an abundant number, since it is smaller than the sum of its proper divisors (241692400).

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

172308320 is a wasteful number, since it uses less digits than its factorization.

172308320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18327 (or 18319 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 172308320 is about 13126.6263754249. The cubic root of 172308320 is about 556.4618766142.

The spelling of 172308320 in words is "one hundred seventy-two million, three hundred eight thousand, three hundred twenty".