13881478782 has 24 divisors (see below), whose sum is σ = 28291068936. Its totient is φ = 4539167568.

The previous prime is 13881478771. The next prime is 13881478783. The reversal of 13881478782 is 28787418831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881478783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2097723 + ... + 2104329.

It is an arithmetic number, because the mean of its divisors is an integer number (1178794539).

Almost surely, 2^13881478782 is an apocalyptic number.

13881478782 is an abundant number, since it is smaller than the sum of its proper divisors (14409590154).

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

13881478782 is an frugal number, since it uses more digits than its factorization.

13881478782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13272 (or 6665 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 57.

The spelling of 13881478782 in words is "thirteen billion, eight hundred eighty-one million, four hundred seventy-eight thousand, seven hundred eighty-two".