280648 has 8 divisors (see below), whose sum is σ = 526230. Its totient is φ = 140320.

The previous prime is 280639. The next prime is 280673. The reversal of 280648 is 846082.

It can be written as a sum of positive squares in only one way, i.e., 191844 + 88804 = 438^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁷ + 8 + 6⁷ + 0 + 4³ + 8³ .

It is an unprimeable number.

280648 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 17533 + ... + 17548.

2²⁸⁰⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

280648 is a deficient number, since it is larger than the sum of its proper divisors (245582).

280648 is a wasteful number, since it uses less digits than its factorization.

280648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35087 (or 35083 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 280648 is about 529.7622108078. The cubic root of 280648 is about 65.4717552016.

The spelling of 280648 in words is "two hundred eighty thousand, six hundred forty-eight".