280560 has 80 divisors (see below), whose sum is σ = 999936. Its totient is φ = 63744.

The previous prime is 280549. The next prime is 280561. The reversal of 280560 is 65082.

It is a happy number.

280560 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280561) by changing a digit.

280560 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 15 ways as a sum of consecutive naturals, for example, 1597 + ... + 1763.

2²⁸⁰⁵⁶⁰ is an apocalyptic number.

280560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499968).

280560 is an abundant number, since it is smaller than the sum of its proper divisors (719376).

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

280560 is a wasteful number, since it uses less digits than its factorization.

280560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 280560 is about 529.6791481642. The cubic root of 280560 is about 65.4649113774.

The spelling of 280560 in words is "two hundred eighty thousand, five hundred sixty".