280663 has 8 divisors (see below), whose sum is σ = 293760. Its totient is φ = 267960.

The previous prime is 280639. The next prime is 280673. The reversal of 280663 is 366082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280663 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 8³ + 6 + 0 + 6⁷ + 3⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3918 + ... + 3988.

It is an arithmetic number, because the mean of its divisors is an integer number (36720).

2²⁸⁰⁶⁶³ is an apocalyptic number.

280663 is a deficient number, since it is larger than the sum of its proper divisors (13097).

280663 is an equidigital number, since it uses as much as digits as its factorization.

280663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 280663 is about 529.7763679139. The cubic root of 280663 is about 65.4729216198.

The spelling of 280663 in words is "two hundred eighty thousand, six hundred sixty-three".