1288663868 has 24 divisors (see below), whose sum is σ = 2268997920. Its totient is φ = 640391360.

The previous prime is 1288663853. The next prime is 1288663897. The reversal of 1288663868 is 8683668821.

It is a congruent number.

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, 540038 + ... + 542418.

It is an arithmetic number, because the mean of its divisors is an integer number (94541580).

Almost surely, 2^1288663868 is an apocalyptic number.

It is an amenable number.

1288663868 is a deficient number, since it is larger than the sum of its proper divisors (980334052).

1288663868 is a wasteful number, since it uses less digits than its factorization.

1288663868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157 (or 3155 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 56.

The square root of 1288663868 is about 35897.9646776805. The cubic root of 1288663868 is about 1088.2112647974.

The spelling of 1288663868 in words is "one billion, two hundred eighty-eight million, six hundred sixty-three thousand, eight hundred sixty-eight".