280478 has 24 divisors (see below), whose sum is σ = 494760. Its totient is φ = 118800.

The previous prime is 280463. The next prime is 280487. The reversal of 280478 is 874082.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 280478.

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 280478.

It is an unprimeable number.

280478 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 11 ways as a sum of consecutive naturals, for example, 4568 + ... + 4628.

It is an arithmetic number, because the mean of its divisors is an integer number (20615).

2²⁸⁰⁴⁷⁸ is an apocalyptic number.

280478 is a deficient number, since it is larger than the sum of its proper divisors (214282).

280478 is a wasteful number, since it uses less digits than its factorization.

280478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 280478 is about 529.6017371573. The cubic root of 280478 is about 65.4585328893.

It can be divided in two parts, 2804 and 78, that added together give a palindrome (2882).

The spelling of 280478 in words is "two hundred eighty thousand, four hundred seventy-eight".