128428 has 12 divisors (see below), whose sum is σ = 227752. Its totient is φ = 63360.

The previous prime is 128413. The next prime is 128431. The reversal of 128428 is 824821.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 11.

It is an unprimeable number.

128428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223 + ... + 553.

2¹²⁸⁴²⁸ is an apocalyptic number.

It is an amenable number.

128428 is a deficient number, since it is larger than the sum of its proper divisors (99324).

128428 is a wasteful number, since it uses less digits than its factorization.

128428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 430 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 128428 is about 358.3685254037. The cubic root of 128428 is about 50.4529509842.

The spelling of 128428 in words is "one hundred twenty-eight thousand, four hundred twenty-eight".