1287671812 has 24 divisors (see below), whose sum is σ = 2599418304. Its totient is φ = 546700512.

The previous prime is 1287671779. The next prime is 1287671821. The reversal of 1287671812 is 2181767821.

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, 211903 + ... + 217894.

It is an arithmetic number, because the mean of its divisors is an integer number (108309096).

Almost surely, 2^1287671812 is an apocalyptic number.

It is an amenable number.

1287671812 is an abundant number, since it is smaller than the sum of its proper divisors (1311746492).

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

1287671812 is a wasteful number, since it uses less digits than its factorization.

1287671812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429915 (or 429913 counting only the distinct ones).

The product of its digits is 75264, while the sum is 43.

The square root of 1287671812 is about 35884.1442980044. The cubic root of 1287671812 is about 1087.9319461200.

The spelling of 1287671812 in words is "one billion, two hundred eighty-seven million, six hundred seventy-one thousand, eight hundred twelve".