280004 has 6 divisors (see below), whose sum is σ = 490014. Its totient is φ = 140000.

The previous prime is 280001. The next prime is 280009. The reversal of 280004 is 400082.

280004 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 9604 = 520^2 + 98^2 .

It is not an unprimeable number, because it can be changed into a prime (280001) by changing a digit.

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, 34997 + ... + 35004.

It is an arithmetic number, because the mean of its divisors is an integer number (81669).

2²⁸⁰⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

280004 is a deficient number, since it is larger than the sum of its proper divisors (210010).

280004 is a wasteful number, since it uses less digits than its factorization.

280004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70005 (or 70003 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 280004 is about 529.1540418441. The cubic root of 280004 is about 65.4216377324.

Adding to 280004 its reverse (400082), we get a palindrome (680086).

The spelling of 280004 in words is "two hundred eighty thousand, four".