172316220 has 24 divisors (see below), whose sum is σ = 482485584. Its totient is φ = 45950976.

The previous prime is 172316213. The next prime is 172316227. The reversal of 172316220 is 22613271.

It is an interprime number because it is at equal distance from previous prime (172316213) and next prime (172316227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172316227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1435909 + ... + 1436028.

It is an arithmetic number, because the mean of its divisors is an integer number (20103566).

Almost surely, 2^172316220 is an apocalyptic number.

172316220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172316220 is an abundant number, since it is smaller than the sum of its proper divisors (310169364).

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

172316220 is a wasteful number, since it uses less digits than its factorization.

172316220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871949 (or 2871947 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 172316220 is about 13126.9272870691. The cubic root of 172316220 is about 556.4703807144.

Adding to 172316220 its reverse (22613271), we get a palindrome (194929491).

The spelling of 172316220 in words is "one hundred seventy-two million, three hundred sixteen thousand, two hundred twenty".