280320 has 72 divisors (see below), whose sum is σ = 907536. Its totient is φ = 73728.

The previous prime is 280303. The next prime is 280321. The reversal of 280320 is 23082.

280320 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 280320.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280320.

It is not an unprimeable number, because it can be changed into a prime (280321) by changing a digit.

280320 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3804 + ... + 3876.

2²⁸⁰³²⁰ is an apocalyptic number.

280320 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 280320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453768).

280320 is an abundant number, since it is smaller than the sum of its proper divisors (627216).

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

280320 is an equidigital number, since it uses as much as digits as its factorization.

280320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 280320 is about 529.4525474488. The cubic root of 280320 is about 65.4462391255.

The spelling of 280320 in words is "two hundred eighty thousand, three hundred twenty".