1287071864 has 16 divisors (see below), whose sum is σ = 2598895320. Its totient is φ = 594033120.

The previous prime is 1287071861. The next prime is 1287071867. The reversal of 1287071864 is 4681707821.

It is an interprime number because it is at equal distance from previous prime (1287071861) and next prime (1287071867).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287071861) 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, 6187742 + ... + 6187949.

Almost surely, 2^1287071864 is an apocalyptic number.

It is an amenable number.

1287071864 is an abundant number, since it is smaller than the sum of its proper divisors (1311823456).

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

1287071864 is a wasteful number, since it uses less digits than its factorization.

1287071864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12375710 (or 12375706 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 1287071864 is about 35875.7838102528. The cubic root of 1287071864 is about 1087.7629579291.

The spelling of 1287071864 in words is "one billion, two hundred eighty-seven million, seventy-one thousand, eight hundred sixty-four".