1287388268 has 12 divisors (see below), whose sum is σ = 2276156232. Its totient is φ = 637057920.

The previous prime is 1287388231. The next prime is 1287388279. The reversal of 1287388268 is 8628837821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1658618 + ... + 1659393.

It is an arithmetic number, because the mean of its divisors is an integer number (189679686).

Almost surely, 2^1287388268 is an apocalyptic number.

It is an amenable number.

1287388268 is a deficient number, since it is larger than the sum of its proper divisors (988767964).

1287388268 is a wasteful number, since it uses less digits than its factorization.

1287388268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318112 (or 3318110 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 53.

The square root of 1287388268 is about 35880.1932547750. The cubic root of 1287388268 is about 1087.8520864286.

The spelling of 1287388268 in words is "one billion, two hundred eighty-seven million, three hundred eighty-eight thousand, two hundred sixty-eight".