172172220 has 96 divisors (see below), whose sum is σ = 528111360. Its totient is φ = 41564160.

The previous prime is 172172201. The next prime is 172172257. The reversal of 172172220 is 22271271.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 232611 + ... + 233349.

It is an arithmetic number, because the mean of its divisors is an integer number (5501160).

Almost surely, 2^172172220 is an apocalyptic number.

172172220 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 172172220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264055680).

172172220 is an abundant number, since it is smaller than the sum of its proper divisors (355939140).

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

172172220 is a wasteful number, since it uses less digits than its factorization.

172172220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 172172220 is about 13121.4412318160. The cubic root of 172172220 is about 556.3153284380.

The spelling of 172172220 in words is "one hundred seventy-two million, one hundred seventy-two thousand, two hundred twenty".