280646 has 8 divisors (see below), whose sum is σ = 439344. Its totient is φ = 134200.

The previous prime is 280639. The next prime is 280673. The reversal of 280646 is 646082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2⁷ + 8³ + 6 + 0 + 4³ + 6⁷ .

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 280646.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3005 + ... + 3096.

It is an arithmetic number, because the mean of its divisors is an integer number (54918).

2²⁸⁰⁶⁴⁶ is an apocalyptic number.

280646 is a deficient number, since it is larger than the sum of its proper divisors (158698).

280646 is a wasteful number, since it uses less digits than its factorization.

280646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 280646 is about 529.7603231651. The cubic root of 280646 is about 65.4715996760.

The spelling of 280646 in words is "two hundred eighty thousand, six hundred forty-six".