280870 has 8 divisors (see below), whose sum is σ = 505584. Its totient is φ = 112344.

The previous prime is 280859. The next prime is 280871. The reversal of 280870 is 78082.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14034 + ... + 14053.

It is an arithmetic number, because the mean of its divisors is an integer number (63198).

2²⁸⁰⁸⁷⁰ is an apocalyptic number.

280870 is a deficient number, since it is larger than the sum of its proper divisors (224714).

280870 is a wasteful number, since it uses less digits than its factorization.

280870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28094.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 280870 is about 529.9716973575. The cubic root of 280870 is about 65.4890139491.

The spelling of 280870 in words is "two hundred eighty thousand, eight hundred seventy".