280806 has 16 divisors (see below), whose sum is σ = 594864. Its totient is φ = 88064.

The previous prime is 280771. The next prime is 280811. The reversal of 280806 is 608082.

280806 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 280806.

It is an unprimeable number.

280806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (37179).

2²⁸⁰⁸⁰⁶ is an apocalyptic number.

280806 is an abundant number, since it is smaller than the sum of its proper divisors (314058).

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

280806 is a wasteful number, since it uses less digits than its factorization.

280806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 280806 is about 529.9113133346. The cubic root of 280806 is about 65.4840393876.

Adding to 280806 its reverse (608082), we get a palindrome (888888).

It can be divided in two parts, 2 and 80806, that added together give a palindrome (80808).

The spelling of 280806 in words is "two hundred eighty thousand, eight hundred six".