280669 has 4 divisors (see below), whose sum is σ = 292896. Its totient is φ = 268444.

The previous prime is 280639. The next prime is 280673. The reversal of 280669 is 966082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 280669 - 2⁷ = 280541 is a prime.

It is a super-2 number, since 2×280669² = 157550175122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280639) 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, 6079 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (73224).

2²⁸⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

280669 is a deficient number, since it is larger than the sum of its proper divisors (12227).

280669 is a wasteful number, since it uses less digits than its factorization.

280669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12226.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 280669 is about 529.7820306503. The cubic root of 280669 is about 65.4733881755.

It can be divided in two parts, 280 and 669, that added together give a palindrome (949).

The spelling of 280669 in words is "two hundred eighty thousand, six hundred sixty-nine".