280704728 has 16 divisors (see below), whose sum is σ = 528282000. Its totient is φ = 139829536.

The previous prime is 280704707. The next prime is 280704733. The reversal of 280704728 is 827407082.

It is a junction number, because it is equal to n+sod(n) for n = 280704691 and 280704700.

It is a congruent number.

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, 63068 + ... + 67371.

It is an arithmetic number, because the mean of its divisors is an integer number (33017625).

Almost surely, 2^280704728 is an apocalyptic number.

It is an amenable number.

280704728 is a deficient number, since it is larger than the sum of its proper divisors (247577272).

280704728 is a wasteful number, since it uses less digits than its factorization.

280704728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130714 (or 130710 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 280704728 is about 16754.2450740103. The cubic root of 280704728 is about 654.7616622123.

The spelling of 280704728 in words is "two hundred eighty million, seven hundred four thousand, seven hundred twenty-eight".