1287512868 has 24 divisors (see below), whose sum is σ = 3055116960. Its totient is φ = 421896640.

The previous prime is 1287512851. The next prime is 1287512869. The reversal of 1287512868 is 8682157821.

It is not an unprimeable number, because it can be changed into a prime (1287512869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908553 + ... + 909968.

It is an arithmetic number, because the mean of its divisors is an integer number (127296540).

Almost surely, 2^1287512868 is an apocalyptic number.

It is an amenable number.

1287512868 is an abundant number, since it is smaller than the sum of its proper divisors (1767604092).

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

1287512868 is a wasteful number, since it uses less digits than its factorization.

1287512868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818587 (or 1818585 counting only the distinct ones).

The product of its digits is 430080, while the sum is 48.

The square root of 1287512868 is about 35881.9295467788. The cubic root of 1287512868 is about 1087.8871812534.

The spelling of 1287512868 in words is "one billion, two hundred eighty-seven million, five hundred twelve thousand, eight hundred sixty-eight".