1287680013 has 12 divisors (see below), whose sum is σ = 1883527360. Its totient is φ = 847586376.

The previous prime is 1287680003. The next prime is 1287680041. The reversal of 1287680013 is 3100867821.

It is not a de Polignac number, because 1287680013 - 2¹³ = 1287671821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287680013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287680003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 904831 + ... + 906252.

Almost surely, 2^1287680013 is an apocalyptic number.

It is an amenable number.

1287680013 is a deficient number, since it is larger than the sum of its proper divisors (595847347).

1287680013 is a wasteful number, since it uses less digits than its factorization.

1287680013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811168 (or 1811165 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1287680013 is about 35884.2585683472. The cubic root of 1287680013 is about 1087.9342557434.

The spelling of 1287680013 in words is "one billion, two hundred eighty-seven million, six hundred eighty thousand, thirteen".