1687540012 has 12 divisors (see below), whose sum is σ = 2966439616. Its totient is φ = 839985840.

The previous prime is 1687539991. The next prime is 1687540109. The reversal of 1687540012 is 2100457861.

It is a self number, because there is not a number n which added to its sum of digits gives 1687540012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945039 + ... + 946822.

Almost surely, 2^1687540012 is an apocalyptic number.

It is an amenable number.

1687540012 is a deficient number, since it is larger than the sum of its proper divisors (1278899604).

1687540012 is a wasteful number, since it uses less digits than its factorization.

1687540012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892088 (or 1892086 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 1687540012 is about 41079.6788205555. The cubic root of 1687540012 is about 1190.5601985449.

Adding to 1687540012 its reverse (2100457861), we get a palindrome (3787997873).

The spelling of 1687540012 in words is "one billion, six hundred eighty-seven million, five hundred forty thousand, twelve".