280668 has 24 divisors (see below), whose sum is σ = 689920. Its totient is φ = 88560.

The previous prime is 280639. The next prime is 280673. The reversal of 280668 is 866082.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 388 + ... + 843.

2²⁸⁰⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

280668 is an abundant number, since it is smaller than the sum of its proper divisors (409252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280668 is a wasteful number, since it uses less digits than its factorization.

280668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257 (or 1255 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 280668 is about 529.7810868651. The cubic root of 280668 is about 65.4733104167.

The spelling of 280668 in words is "two hundred eighty thousand, six hundred sixty-eight".