280128 has 28 divisors (see below), whose sum is σ = 741680. Its totient is φ = 93312.

The previous prime is 280121. The next prime is 280129. The reversal of 280128 is 821082.

It is not an unprimeable number, because it can be changed into a prime (280121) by changing a digit.

280128 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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538 + ... + 921.

2²⁸⁰¹²⁸ is an apocalyptic number.

It is an amenable number.

280128 is an abundant number, since it is smaller than the sum of its proper divisors (461552).

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

280128 is a wasteful number, since it uses less digits than its factorization.

280128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 280128 is about 529.2711970247. The cubic root of 280128 is about 65.4312936491.

The spelling of 280128 in words is "two hundred eighty thousand, one hundred twenty-eight".