280079 has 4 divisors (see below), whose sum is σ = 294840. Its totient is φ = 265320.

The previous prime is 280069. The next prime is 280097. The reversal of 280079 is 970082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 970082 = 2 ⋅485041.

It is a cyclic number.

It is not a de Polignac number, because 280079 - 2⁸ = 279823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7352 + ... + 7389.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2²⁸⁰⁰⁷⁹ is an apocalyptic number.

280079 is a deficient number, since it is larger than the sum of its proper divisors (14761).

280079 is a wasteful number, since it uses less digits than its factorization.

280079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14760.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 280079 is about 529.2249049317. The cubic root of 280079 is about 65.4274783452.

The spelling of 280079 in words is "two hundred eighty thousand, seventy-nine".