280706 has 16 divisors (see below), whose sum is σ = 453600. Its totient is φ = 129888.

The previous prime is 280703. The next prime is 280711. The reversal of 280706 is 607082.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280706.

It is not an unprimeable number, because it can be changed into a prime (280703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3110 + ... + 3198.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2²⁸⁰⁷⁰⁶ is an apocalyptic number.

280706 is a deficient number, since it is larger than the sum of its proper divisors (172894).

280706 is a wasteful number, since it uses less digits than its factorization.

280706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 280706 is about 529.8169495212. The cubic root of 280706 is about 65.4762651218.

Adding to 280706 its reverse (607082), we get a palindrome (887788).

It can be divided in two parts, 2 and 80706, that added together give a palindrome (80708).

The spelling of 280706 in words is "two hundred eighty thousand, seven hundred six".