170428 has 12 divisors (see below), whose sum is σ = 301392. Its totient is φ = 84320.

The previous prime is 170413. The next prime is 170441. The reversal of 170428 is 824071.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 170399 and 170408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393 + ... + 703.

It is an arithmetic number, because the mean of its divisors is an integer number (25116).

2¹⁷⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

170428 is a deficient number, since it is larger than the sum of its proper divisors (130964).

170428 is a wasteful number, since it uses less digits than its factorization.

170428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 170428 is about 412.8292625287. The cubic root of 170428 is about 55.4430332882.

Adding to 170428 its reverse (824071), we get a palindrome (994499).

The spelling of 170428 in words is "one hundred seventy thousand, four hundred twenty-eight".