320428 has 6 divisors (see below), whose sum is σ = 560756. Its totient is φ = 160212.

The previous prime is 320417. The next prime is 320431. The reversal of 320428 is 824023.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40050 + ... + 40057.

2³²⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

320428 is a deficient number, since it is larger than the sum of its proper divisors (240328).

320428 is a wasteful number, since it uses less digits than its factorization.

320428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80111 (or 80109 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 320428 is about 566.0636006669. The cubic root of 320428 is about 68.4295188527.

The spelling of 320428 in words is "three hundred twenty thousand, four hundred twenty-eight".