17987865772 has 12 divisors (see below), whose sum is σ = 31484013120. Its totient is φ = 8992433456.

The previous prime is 17987865751. The next prime is 17987865809. The reversal of 17987865772 is 27756878971.

It is a junction number, because it is equal to n+sod(n) for n = 17987865698 and 17987865707.

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, 347647 + ... + 396022.

It is an arithmetic number, because the mean of its divisors is an integer number (2623667760).

Almost surely, 2^17987865772 is an apocalyptic number.

It is an amenable number.

17987865772 is a deficient number, since it is larger than the sum of its proper divisors (13496147348).

17987865772 is a wasteful number, since it uses less digits than its factorization.

17987865772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749720 (or 749718 counting only the distinct ones).

The product of its digits is 82978560, while the sum is 67.

The spelling of 17987865772 in words is "seventeen billion, nine hundred eighty-seven million, eight hundred sixty-five thousand, seven hundred seventy-two".