280065 has 8 divisors (see below), whose sum is σ = 448128. Its totient is φ = 149360.

The previous prime is 280061. The next prime is 280069. The reversal of 280065 is 560082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (280061) and next prime (280069).

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

It is not a de Polignac number, because 280065 - 2² = 280061 is a prime.

280065 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (280061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9321 + ... + 9350.

It is an arithmetic number, because the mean of its divisors is an integer number (56016).

2²⁸⁰⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

280065 is a deficient number, since it is larger than the sum of its proper divisors (168063).

280065 is a wasteful number, since it uses less digits than its factorization.

280065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18679.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 280065 is about 529.2116778757. The cubic root of 280065 is about 65.4263881766.

The spelling of 280065 in words is "two hundred eighty thousand, sixty-five".