8721473856 has 56 divisors (see below), whose sum is σ = 23133893280. Its totient is φ = 2899809792.

The previous prime is 8721473843. The next prime is 8721473861. The reversal of 8721473856 is 6583741278.

It is a junction number, because it is equal to n+sod(n) for n = 8721473799 and 8721473808.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 19015 + ... + 133433.

Almost surely, 2^8721473856 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 8721473856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11566946640).

8721473856 is an abundant number, since it is smaller than the sum of its proper divisors (14412419424).

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

8721473856 is a wasteful number, since it uses less digits than its factorization.

8721473856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114831 (or 114821 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 8721473856 is about 93388.8315378236. The cubic root of 8721473856 is about 2058.4008905092.

The spelling of 8721473856 in words is "eight billion, seven hundred twenty-one million, four hundred seventy-three thousand, eight hundred fifty-six".