172428 has 12 divisors (see below), whose sum is σ = 402360. Its totient is φ = 57472.

The previous prime is 172427. The next prime is 172433. The reversal of 172428 is 824271.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 172398 and 172407.

It is not an unprimeable number, because it can be changed into a prime (172421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7173 + ... + 7196.

It is an arithmetic number, because the mean of its divisors is an integer number (33530).

2¹⁷²⁴²⁸ is an apocalyptic number.

It is an amenable number.

172428 is an abundant number, since it is smaller than the sum of its proper divisors (229932).

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

172428 is a wasteful number, since it uses less digits than its factorization.

172428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14376 (or 14374 counting only the distinct ones).

The product of its digits is 896, while the sum is 24.

The square root of 172428 is about 415.2445062852. The cubic root of 172428 is about 55.6590680502.

Adding to 172428 its reverse (824271), we get a palindrome (996699).

The spelling of 172428 in words is "one hundred seventy-two thousand, four hundred twenty-eight".