1287893868 has 12 divisors (see below), whose sum is σ = 3005085720. Its totient is φ = 429297952.

The previous prime is 1287893863. The next prime is 1287893869. The reversal of 1287893868 is 8683987821.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1287893863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53662233 + ... + 53662256.

It is an arithmetic number, because the mean of its divisors is an integer number (250423810).

Almost surely, 2^1287893868 is an apocalyptic number.

It is an amenable number.

1287893868 is an abundant number, since it is smaller than the sum of its proper divisors (1717191852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287893868 is a wasteful number, since it uses less digits than its factorization.

1287893868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107324496 (or 107324494 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 60.

The square root of 1287893868 is about 35887.2382331101. The cubic root of 1287893868 is about 1087.9944796343.

The spelling of 1287893868 in words is "one billion, two hundred eighty-seven million, eight hundred ninety-three thousand, eight hundred sixty-eight".