280808 has 16 divisors (see below), whose sum is σ = 574560. Its totient is φ = 127600.

The previous prime is 280771. The next prime is 280811. The reversal of 280808 is 808082.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280808.

It is an unprimeable number.

280808 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1508 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (35910).

2²⁸⁰⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

280808 is an abundant number, since it is smaller than the sum of its proper divisors (293752).

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

280808 is a wasteful number, since it uses less digits than its factorization.

280808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208 (or 3204 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 280808 is about 529.9132004395. The cubic root of 280808 is about 65.4841948540.

The spelling of 280808 in words is "two hundred eighty thousand, eight hundred eight".