280304 has 10 divisors (see below), whose sum is σ = 543120. Its totient is φ = 140144.

The previous prime is 280303. The next prime is 280321. The reversal of 280304 is 403082.

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 280304.

It is not an unprimeable number, because it can be changed into a prime (280303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8744 + ... + 8775.

It is an arithmetic number, because the mean of its divisors is an integer number (54312).

2²⁸⁰³⁰⁴ is an apocalyptic number.

It is an amenable number.

280304 is a deficient number, since it is larger than the sum of its proper divisors (262816).

280304 is a wasteful number, since it uses less digits than its factorization.

280304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17527 (or 17521 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 280304 is about 529.4374372860. The cubic root of 280304 is about 65.4449939299. Note that the first 3 decimals are identical.

Adding to 280304 its reverse (403082), we get a palindrome (683386).

The spelling of 280304 in words is "two hundred eighty thousand, three hundred four".