38891786856 has 128 divisors (see below), whose sum is σ = 111886790400. Its totient is φ = 11159285760.

The previous prime is 38891786833. The next prime is 38891786861. The reversal of 38891786856 is 65868719883.

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 31 ways as a sum of consecutive naturals, for example, 544501 + ... + 611771.

It is an arithmetic number, because the mean of its divisors is an integer number (874115550).

Almost surely, 2^38891786856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38891786856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55943395200).

38891786856 is an abundant number, since it is smaller than the sum of its proper divisors (72995003544).

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

38891786856 is a wasteful number, since it uses less digits than its factorization.

38891786856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67419 (or 67415 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 69.

The spelling of 38891786856 in words is "thirty-eight billion, eight hundred ninety-one million, seven hundred eighty-six thousand, eight hundred fifty-six".