280478768 has 20 divisors (see below), whose sum is σ = 545456160. Its totient is φ = 139715904.

The previous prime is 280478719. The next prime is 280478777. The reversal of 280478768 is 867874082.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

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, 28280 + ... + 36887.

It is an arithmetic number, because the mean of its divisors is an integer number (27272808).

Almost surely, 2^280478768 is an apocalyptic number.

It is an amenable number.

280478768 is a deficient number, since it is larger than the sum of its proper divisors (264977392).

280478768 is a wasteful number, since it uses less digits than its factorization.

280478768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65444 (or 65438 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 50.

The square root of 280478768 is about 16747.5003507986. The cubic root of 280478768 is about 654.5859263508.

The spelling of 280478768 in words is "two hundred eighty million, four hundred seventy-eight thousand, seven hundred sixty-eight".