13887209808 has 80 divisors (see below), whose sum is σ = 39875543040. Its totient is φ = 4627431936.

The previous prime is 13887209789. The next prime is 13887209837. The reversal of 13887209808 is 80890278831.

It is a super-4 number, since 4×13887209808⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 2257585 + ... + 2263727.

It is an arithmetic number, because the mean of its divisors is an integer number (498444288).

Almost surely, 2^13887209808 is an apocalyptic number.

13887209808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13887209808 is an abundant number, since it is smaller than the sum of its proper divisors (25988333232).

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

13887209808 is a wasteful number, since it uses less digits than its factorization.

13887209808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11393 (or 11381 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 13887209808 in words is "thirteen billion, eight hundred eighty-seven million, two hundred nine thousand, eight hundred eight".