280456 has 16 divisors (see below), whose sum is σ = 573840. Its totient is φ = 127440.

The previous prime is 280451. The next prime is 280463. The reversal of 280456 is 654082.

280456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 280456.

It is not an unprimeable number, because it can be changed into a prime (280451) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1506 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (35865).

2²⁸⁰⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

280456 is an abundant number, since it is smaller than the sum of its proper divisors (293384).

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

280456 is a wasteful number, since it uses less digits than its factorization.

280456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204 (or 3200 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 280456 is about 529.5809664253. The cubic root of 280456 is about 65.4568213762.

Adding to 280456 its product of nonzero digits (1920), we get a triangular number (282376 = T₇₅₁).

The spelling of 280456 in words is "two hundred eighty thousand, four hundred fifty-six".