280520 has 16 divisors (see below), whose sum is σ = 631260. Its totient is φ = 112192.

The previous prime is 280513. The next prime is 280537. The reversal of 280520 is 25082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 276676 + 3844 = 526^2 + 62^2 .

It is a nialpdrome in base 14.

It is an unprimeable number.

280520 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, 3467 + ... + 3546.

2²⁸⁰⁵²⁰ is an apocalyptic number.

280520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280520 is an abundant number, since it is smaller than the sum of its proper divisors (350740).

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

280520 is a wasteful number, since it uses less digits than its factorization.

280520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024 (or 7020 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 280520 is about 529.6413881109. The cubic root of 280520 is about 65.4618000751.

The spelling of 280520 in words is "two hundred eighty thousand, five hundred twenty".