13780001856 has 112 divisors (see below), whose sum is σ = 36922374720. Its totient is φ = 4535408640.

The previous prime is 13780001821. The next prime is 13780001861. The reversal of 13780001856 is 65810008731.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5256226 + ... + 5258846.

It is an arithmetic number, because the mean of its divisors is an integer number (329664060).

Almost surely, 2^13780001856 is an apocalyptic number.

13780001856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13780001856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18461187360).

13780001856 is an abundant number, since it is smaller than the sum of its proper divisors (23142372864).

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

13780001856 is a wasteful number, since it uses less digits than its factorization.

13780001856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972 (or 2962 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 13780001856 in words is "thirteen billion, seven hundred eighty million, one thousand, eight hundred fifty-six".