280285 has 8 divisors (see below), whose sum is σ = 348120. Its totient is φ = 216384.

The previous prime is 280277. The next prime is 280297. The reversal of 280285 is 582082.

It can be written as a sum of positive squares in 4 ways, for example, as 47961 + 232324 = 219^2 + 482^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 280285 - 2³ = 280277 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822 + ... + 1111.

It is an arithmetic number, because the mean of its divisors is an integer number (43515).

2²⁸⁰²⁸⁵ is an apocalyptic number.

It is an amenable number.

280285 is a deficient number, since it is larger than the sum of its proper divisors (67835).

280285 is a wasteful number, since it uses less digits than its factorization.

280285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 280285 is about 529.4194934076. The cubic root of 280285 is about 65.4435151985.

It can be divided in two parts, 280 and 285, that multiplied together give a triangular number (79800 = T₃₉₉).

The spelling of 280285 in words is "two hundred eighty thousand, two hundred eighty-five".