280804 has 6 divisors (see below), whose sum is σ = 491414. Its totient is φ = 140400.

The previous prime is 280771. The next prime is 280811. The reversal of 280804 is 408082.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 10404 = 520^2 + 102^2 .

It is an unprimeable number.

280804 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 as a sum of consecutive naturals, namely, 35097 + ... + 35104.

2²⁸⁰⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

280804 is a deficient number, since it is larger than the sum of its proper divisors (210610).

280804 is a wasteful number, since it uses less digits than its factorization.

280804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70205 (or 70203 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 280804 is about 529.9094262230. The cubic root of 280804 is about 65.4838839203.

Adding to 280804 its reverse (408082), we get a palindrome (688886).

The spelling of 280804 in words is "two hundred eighty thousand, eight hundred four".