280667 has 4 divisors (see below), whose sum is σ = 281736. Its totient is φ = 279600.

The previous prime is 280639. The next prime is 280673. The reversal of 280667 is 766082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 766082 = 2 ⋅383041.

It is a cyclic number.

It is not a de Polignac number, because 280667 - 2⁶ = 280603 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280607) 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, 167 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (70434).

2²⁸⁰⁶⁶⁷ is an apocalyptic number.

280667 is a deficient number, since it is larger than the sum of its proper divisors (1069).

280667 is an equidigital number, since it uses as much as digits as its factorization.

280667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 280667 is about 529.7801430782. The cubic root of 280667 is about 65.4732326577.

The spelling of 280667 in words is "two hundred eighty thousand, six hundred sixty-seven".