328428 has 24 divisors (see below), whose sum is σ = 851760. Its totient is φ = 109440.

The previous prime is 328421. The next prime is 328429. The reversal of 328428 is 824823.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 328428.

It is not an unprimeable number, because it can be changed into a prime (328421) by changing a digit.

328428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1413 + ... + 1628.

It is an arithmetic number, because the mean of its divisors is an integer number (35490).

2³²⁸⁴²⁸ is an apocalyptic number.

It is an amenable number.

328428 is an abundant number, since it is smaller than the sum of its proper divisors (523332).

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

328428 is a wasteful number, since it uses less digits than its factorization.

328428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3054 (or 3046 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 328428 is about 573.0863809235. The cubic root of 328428 is about 68.9943284563.

Adding to 328428 its sum of digits (27), we get a triangular number (328455 = T₈₁₀).

The spelling of 328428 in words is "three hundred twenty-eight thousand, four hundred twenty-eight".