171228420 has 144 divisors (see below), whose sum is σ = 600058368. Its totient is φ = 39060480.

The previous prime is 171228373. The next prime is 171228433. The reversal of 171228420 is 24822171.

171228420 is a `hidden beast` number, since 17 + 1 + 228 + 420 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31117 + ... + 36203.

It is an arithmetic number, because the mean of its divisors is an integer number (4167072).

Almost surely, 2^171228420 is an apocalyptic number.

171228420 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 171228420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300029184).

171228420 is an abundant number, since it is smaller than the sum of its proper divisors (428829948).

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

171228420 is a wasteful number, since it uses less digits than its factorization.

171228420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130 (or 5125 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 171228420 is about 13085.4277729083. The cubic root of 171228420 is about 555.2969436048.

The spelling of 171228420 in words is "one hundred seventy-one million, two hundred twenty-eight thousand, four hundred twenty".