1286821768 has 32 divisors (see below), whose sum is σ = 2462788800. Its totient is φ = 630122688.

The previous prime is 1286821751. The next prime is 1286821771. The reversal of 1286821768 is 8671286821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260005 + ... + 264907.

It is an arithmetic number, because the mean of its divisors is an integer number (76962150).

Almost surely, 2^1286821768 is an apocalyptic number.

It is an amenable number.

1286821768 is a deficient number, since it is larger than the sum of its proper divisors (1175967032).

1286821768 is a wasteful number, since it uses less digits than its factorization.

1286821768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581 (or 5577 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 1286821768 is about 35872.2980585298. The cubic root of 1286821768 is about 1087.6924975311.

The spelling of 1286821768 in words is "one billion, two hundred eighty-six million, eight hundred twenty-one thousand, seven hundred sixty-eight".