280512 has 42 divisors (see below), whose sum is σ = 805688. Its totient is φ = 93312.

The previous prime is 280507. The next prime is 280513. The reversal of 280512 is 215082.

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

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 280512.

It is not an unprimeable number, because it can be changed into a prime (280513) by changing a digit.

280512 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 (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333 + ... + 819.

2²⁸⁰⁵¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402844).

280512 is an abundant number, since it is smaller than the sum of its proper divisors (525176).

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

280512 is a wasteful number, since it uses less digits than its factorization.

280512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 280512 is about 529.6338357771. The cubic root of 280512 is about 65.4611777791.

Adding to 280512 its reverse (215082), we get a palindrome (495594).

The spelling of 280512 in words is "two hundred eighty thousand, five hundred twelve".