280928 has 12 divisors (see below), whose sum is σ = 553140. Its totient is φ = 140448.

The previous prime is 280927. The next prime is 280933. The reversal of 280928 is 829082.

280928 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 280928.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280928.

It is not an unprimeable number, because it can be changed into a prime (280921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4358 + ... + 4421.

It is an arithmetic number, because the mean of its divisors is an integer number (46095).

2²⁸⁰⁹²⁸ is an apocalyptic number.

It is an amenable number.

280928 is a deficient number, since it is larger than the sum of its proper divisors (272212).

280928 is an equidigital number, since it uses as much as digits as its factorization.

280928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8789 (or 8781 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 280928 is about 530.0264144361. The cubic root of 280928 is about 65.4935214928.

The spelling of 280928 in words is "two hundred eighty thousand, nine hundred twenty-eight".