280056 has 32 divisors (see below), whose sum is σ = 800640. Its totient is φ = 79968.

The previous prime is 280037. The next prime is 280061. The reversal of 280056 is 650082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

280056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666 + ... + 1001.

It is an arithmetic number, because the mean of its divisors is an integer number (25020).

2²⁸⁰⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

280056 is an abundant number, since it is smaller than the sum of its proper divisors (520584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280056 is a wasteful number, since it uses less digits than its factorization.

280056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683 (or 1679 counting only the distinct ones).

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

The square root of 280056 is about 529.2031745937. The cubic root of 280056 is about 65.4256873348.

The spelling of 280056 in words is "two hundred eighty thousand, fifty-six".