280655 has 4 divisors (see below), whose sum is σ = 336792. Its totient is φ = 224520.

The previous prime is 280639. The next prime is 280673. The reversal of 280655 is 556082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556082 = 2 ⋅278041.

It is not a de Polignac number, because 280655 - 2⁴ = 280639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280655.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28061 + ... + 28070.

It is an arithmetic number, because the mean of its divisors is an integer number (84198).

2²⁸⁰⁶⁵⁵ is an apocalyptic number.

280655 is a deficient number, since it is larger than the sum of its proper divisors (56137).

280655 is an equidigital number, since it uses as much as digits as its factorization.

280655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56136.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 280655 is about 529.7688175044. The cubic root of 280655 is about 65.4722995353.

The spelling of 280655 in words is "two hundred eighty thousand, six hundred fifty-five".