280660 has 12 divisors (see below), whose sum is σ = 589428. Its totient is φ = 112256.

The previous prime is 280639. The next prime is 280673. The reversal of 280660 is 66082.

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 217156 = 252^2 + 466^2 .

It is a congruent number.

It is an unprimeable number.

280660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6997 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (49119).

2²⁸⁰⁶⁶⁰ is an apocalyptic number.

280660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280660 is an abundant number, since it is smaller than the sum of its proper divisors (308768).

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

280660 is a wasteful number, since it uses less digits than its factorization.

280660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14042 (or 14040 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 280660 is about 529.7735365229. The cubic root of 280660 is about 65.4726883395.

The spelling of 280660 in words is "two hundred eighty thousand, six hundred sixty".