13987687956 has 48 divisors (see below), whose sum is σ = 35712703488. Its totient is φ = 4225874400.

The previous prime is 13987687951. The next prime is 13987687991. The reversal of 13987687956 is 65978678931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13987687951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116380 + ... + 203763.

It is an arithmetic number, because the mean of its divisors is an integer number (744014656).

Almost surely, 2^13987687956 is an apocalyptic number.

It is an amenable number.

13987687956 is an abundant number, since it is smaller than the sum of its proper divisors (21725015532).

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

13987687956 is a wasteful number, since it uses less digits than its factorization.

13987687956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320492 (or 320490 counting only the distinct ones).

The product of its digits is 137168640, while the sum is 69.

The spelling of 13987687956 in words is "thirteen billion, nine hundred eighty-seven million, six hundred eighty-seven thousand, nine hundred fifty-six".