280825 has 12 divisors (see below), whose sum is σ = 357120. Its totient is φ = 218960.

The previous prime is 280817. The next prime is 280837. The reversal of 280825 is 528082.

280825 = T₈₀ + T₈₁ + ... + T₁₂₉.

It is not a de Polignac number, because 280825 - 2³ = 280817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 280825.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1056 + ... + 1294.

It is an arithmetic number, because the mean of its divisors is an integer number (29760).

2²⁸⁰⁸²⁵ is an apocalyptic number.

280825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280825 is a deficient number, since it is larger than the sum of its proper divisors (76295).

280825 is a wasteful number, since it uses less digits than its factorization.

280825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 291 counting only the distinct ones).

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

The square root of 280825 is about 529.9292405595. The cubic root of 280825 is about 65.4855162894.

The spelling of 280825 in words is "two hundred eighty thousand, eight hundred twenty-five".