280485 has 24 divisors (see below), whose sum is σ = 509184. Its totient is φ = 142560.

The previous prime is 280463. The next prime is 280487. The reversal of 280485 is 584082.

It is not a de Polignac number, because 280485 - 2⁸ = 280229 is a prime.

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 280485.

It is not an unprimeable number, because it can be changed into a prime (280487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 900 + ... + 1170.

It is an arithmetic number, because the mean of its divisors is an integer number (21216).

2²⁸⁰⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

280485 is a deficient number, since it is larger than the sum of its proper divisors (228699).

280485 is a wasteful number, since it uses less digits than its factorization.

280485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 280485 is about 529.6083458557. The cubic root of 280485 is about 65.4590774429.

The spelling of 280485 in words is "two hundred eighty thousand, four hundred eighty-five".