172162220 has 48 divisors (see below), whose sum is σ = 378556416. Its totient is φ = 65688000.

The previous prime is 172162219. The next prime is 172162229. The reversal of 172162220 is 22261271.

It is a happy number.

172162220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172162229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42065 + ... + 45975.

It is an arithmetic number, because the mean of its divisors is an integer number (7886592).

Almost surely, 2^172162220 is an apocalyptic number.

172162220 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 172162220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189278208).

172162220 is an abundant number, since it is smaller than the sum of its proper divisors (206394196).

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

172162220 is a wasteful number, since it uses less digits than its factorization.

172162220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022 (or 4020 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 172162220 is about 13121.0601705807. The cubic root of 172162220 is about 556.3045577090.

The spelling of 172162220 in words is "one hundred seventy-two million, one hundred sixty-two thousand, two hundred twenty".