280308 has 48 divisors (see below), whose sum is σ = 774144. Its totient is φ = 77280.

The previous prime is 280303. The next prime is 280321. The reversal of 280308 is 803082.

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

280308 is a modest number, since divided by 308 gives 28 as remainder.

It is a nialpdrome in base 14.

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 280308.

It is not an unprimeable number, because it can be changed into a prime (280303) 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, 3913 + ... + 3983.

It is an arithmetic number, because the mean of its divisors is an integer number (16128).

2²⁸⁰³⁰⁸ is an apocalyptic number.

280308 is a gapful number since it is divisible by the number (28) 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 280308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387072).

280308 is an abundant number, since it is smaller than the sum of its proper divisors (493836).

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

280308 is a wasteful number, since it uses less digits than its factorization.

280308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 280308 is about 529.4412148671. The cubic root of 280308 is about 65.4453052332.

The spelling of 280308 in words is "two hundred eighty thousand, three hundred eight".