172271220 has 48 divisors (see below), whose sum is σ = 526212288. Its totient is φ = 41762560.

The previous prime is 172271213. The next prime is 172271243. The reversal of 172271220 is 22172271.

172271220 = 11² + 12² + ... + 802².

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, 129849 + ... + 131168.

It is an arithmetic number, because the mean of its divisors is an integer number (10962756).

Almost surely, 2^172271220 is an apocalyptic number.

172271220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172271220 is an abundant number, since it is smaller than the sum of its proper divisors (353941068).

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

172271220 is a wasteful number, since it uses less digits than its factorization.

172271220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261040 (or 261038 counting only the distinct ones).

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

The square root of 172271220 is about 13125.2131411265. The cubic root of 172271220 is about 556.4219361604.

The spelling of 172271220 in words is "one hundred seventy-two million, two hundred seventy-one thousand, two hundred twenty".