1287671887 has 8 divisors (see below), whose sum is σ = 1295252000. Its totient is φ = 1280103264.

The previous prime is 1287671881. The next prime is 1287671899. The reversal of 1287671887 is 7881767821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1287671887 - 2²³ = 1279283279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287671881) 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, 330193 + ... + 334069.

It is an arithmetic number, because the mean of its divisors is an integer number (161906500).

Almost surely, 2^1287671887 is an apocalyptic number.

1287671887 is a deficient number, since it is larger than the sum of its proper divisors (7580113).

1287671887 is a wasteful number, since it uses less digits than its factorization.

1287671887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5745.

The product of its digits is 2107392, while the sum is 55.

The square root of 1287671887 is about 35884.1453430342. The cubic root of 1287671887 is about 1087.9319672421.

The spelling of 1287671887 in words is "one billion, two hundred eighty-seven million, six hundred seventy-one thousand, eight hundred eighty-seven".