13981640208 has 80 divisors (see below), whose sum is σ = 38262818880. Its totient is φ = 4384227328.

The previous prime is 13981640159. The next prime is 13981640279. The reversal of 13981640208 is 80204618931.

It is a self number, because there is not a number n which added to its sum of digits gives 13981640208.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2713891 + ... + 2719037.

It is an arithmetic number, because the mean of its divisors is an integer number (478285236).

Almost surely, 2^13981640208 is an apocalyptic number.

It is an amenable number.

13981640208 is an abundant number, since it is smaller than the sum of its proper divisors (24281178672).

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

13981640208 is a wasteful number, since it uses less digits than its factorization.

13981640208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8504 (or 8498 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 13981640208 in words is "thirteen billion, nine hundred eighty-one million, six hundred forty thousand, two hundred eight".