171172428 has 48 divisors (see below), whose sum is σ = 459137280. Its totient is φ = 48619584.

The previous prime is 171172423. The next prime is 171172433. The reversal of 171172428 is 824271171.

171172428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (171172423) and next prime (171172433).

It is not an unprimeable number, because it can be changed into a prime (171172423) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8643 + ... + 20421.

It is an arithmetic number, because the mean of its divisors is an integer number (9565360).

Almost surely, 2^171172428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171172428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229568640).

171172428 is an abundant number, since it is smaller than the sum of its proper divisors (287964852).

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

171172428 is a wasteful number, since it uses less digits than its factorization.

171172428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11966 (or 11964 counting only the distinct ones).

The product of its digits is 6272, while the sum is 33.

The square root of 171172428 is about 13083.2881188178. The cubic root of 171172428 is about 555.2364093077.

The spelling of 171172428 in words is "one hundred seventy-one million, one hundred seventy-two thousand, four hundred twenty-eight".