172106420 has 48 divisors (see below), whose sum is σ = 377395200. Its totient is φ = 65852160.

The previous prime is 172106381. The next prime is 172106461. The reversal of 172106420 is 24601271.

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, 53621 + ... + 56739.

It is an arithmetic number, because the mean of its divisors is an integer number (7862400).

Almost surely, 2^172106420 is an apocalyptic number.

172106420 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 172106420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188697600).

172106420 is an abundant number, since it is smaller than the sum of its proper divisors (205288780).

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

172106420 is a wasteful number, since it uses less digits than its factorization.

172106420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248 (or 3246 counting only the distinct ones).

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

The square root of 172106420 is about 13118.9336456893. The cubic root of 172106420 is about 556.2444493828.

Adding to 172106420 its reverse (24601271), we get a palindrome (196707691).

The spelling of 172106420 in words is "one hundred seventy-two million, one hundred six thousand, four hundred twenty".