280536 has 16 divisors (see below), whose sum is σ = 701400. Its totient is φ = 93504.

The previous prime is 280513. The next prime is 280537. The reversal of 280536 is 635082.

280536 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 (24), and also a Moran number because the ratio is a prime number: 11689 = 280536 / (2 + 8 + 0 + 5 + 3 + 6).

It is a d-powerful number, because it can be written as 2 + 8³ + 5 + 0 + 3⁴ + 6⁷ .

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 5821 + ... + 5868.

2²⁸⁰⁵³⁶ is an apocalyptic number.

It is an amenable number.

280536 is an abundant number, since it is smaller than the sum of its proper divisors (420864).

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

280536 is a wasteful number, since it uses less digits than its factorization.

280536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11698 (or 11694 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 280536 is about 529.6564924553. The cubic root of 280536 is about 65.4630446315.

The spelling of 280536 in words is "two hundred eighty thousand, five hundred thirty-six".