280563 has 8 divisors (see below), whose sum is σ = 383376. Its totient is φ = 182400.

The previous prime is 280561. The next prime is 280583. The reversal of 280563 is 365082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280563 - 2¹ = 280561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018 + ... + 1263.

It is an arithmetic number, because the mean of its divisors is an integer number (47922).

2²⁸⁰⁵⁶³ is an apocalyptic number.

280563 is a deficient number, since it is larger than the sum of its proper divisors (102813).

280563 is a wasteful number, since it uses less digits than its factorization.

280563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325.

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

The square root of 280563 is about 529.6819800597. The cubic root of 280563 is about 65.4651447131.

It can be divided in two parts, 2805 and 63, that multiplied together give a triangular number (176715 = T₅₉₄).

The spelling of 280563 in words is "two hundred eighty thousand, five hundred sixty-three".