280647 has 6 divisors (see below), whose sum is σ = 405392. Its totient is φ = 187092.

The previous prime is 280639. The next prime is 280673. The reversal of 280647 is 746082.

It is not a de Polignac number, because 280647 - 2³ = 280639 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 8³ + 6⁷ + 0 + 4³ + 7 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280647.

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 280647.

It is not an unprimeable number, because it can be changed into a prime (280607) 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 in 5 ways as a sum of consecutive naturals, for example, 15583 + ... + 15600.

2²⁸⁰⁶⁴⁷ is an apocalyptic number.

280647 is a deficient number, since it is larger than the sum of its proper divisors (124745).

280647 is a wasteful number, since it uses less digits than its factorization.

280647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31189 (or 31186 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 280647 is about 529.7612669873. The cubic root of 280647 is about 65.4716774389.

The spelling of 280647 in words is "two hundred eighty thousand, six hundred forty-seven".