280530 has 32 divisors (see below), whose sum is σ = 748800. Its totient is φ = 74736.

The previous prime is 280513. The next prime is 280537. The reversal of 280530 is 35082.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (280537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250 + ... + 789.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2²⁸⁰⁵³⁰ is an apocalyptic number.

280530 is an abundant number, since it is smaller than the sum of its proper divisors (468270).

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

280530 is a wasteful number, since it uses less digits than its factorization.

280530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 280530 is about 529.6508283766. The cubic root of 280530 is about 65.4625779284.

The spelling of 280530 in words is "two hundred eighty thousand, five hundred thirty".