280063 has 4 divisors (see below), whose sum is σ = 320080. Its totient is φ = 240048.

The previous prime is 280061. The next prime is 280069. The reversal of 280063 is 360082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280063 - 2¹ = 280061 is a prime.

It is a Duffinian number.

280063 is a modest number, since divided by 63 gives 28 as remainder.

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 280063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280061) 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, 19998 + ... + 20011.

It is an arithmetic number, because the mean of its divisors is an integer number (80020).

2²⁸⁰⁰⁶³ is an apocalyptic number.

280063 is a deficient number, since it is larger than the sum of its proper divisors (40017).

280063 is an equidigital number, since it uses as much as digits as its factorization.

280063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40016.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 280063 is about 529.2097882693. The cubic root of 280063 is about 65.4262324353.

Adding to 280063 its sum of digits (19), we get a palindrome (280082).

It can be divided in two parts, 2800 and 63, that multiplied together give a square (176400 = 420²).

The spelling of 280063 in words is "two hundred eighty thousand, sixty-three".