280478396 has 12 divisors (see below), whose sum is σ = 535458840. Its totient is φ = 127490160.

The previous prime is 280478377. The next prime is 280478413. The reversal of 280478396 is 693874082.

It is a self number, because there is not a number n which added to its sum of digits gives 280478396.

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, 3187211 + ... + 3187298.

It is an arithmetic number, because the mean of its divisors is an integer number (44621570).

Almost surely, 2^280478396 is an apocalyptic number.

It is an amenable number.

280478396 is a deficient number, since it is larger than the sum of its proper divisors (254980444).

280478396 is a wasteful number, since it uses less digits than its factorization.

280478396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6374524 (or 6374522 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 280478396 is about 16747.4892446599. The cubic root of 280478396 is about 654.5856369575.

The spelling of 280478396 in words is "two hundred eighty million, four hundred seventy-eight thousand, three hundred ninety-six".