8021806386 has 64 divisors (see below), whose sum is σ = 18140664960. Its totient is φ = 2343375360.

The previous prime is 8021806367. The next prime is 8021806399. The reversal of 8021806386 is 6836081208.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251110 + ... + 281246.

It is an arithmetic number, because the mean of its divisors is an integer number (283447890).

Almost surely, 2^8021806386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8021806386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9070332480).

8021806386 is an abundant number, since it is smaller than the sum of its proper divisors (10118858574).

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

8021806386 is a wasteful number, since it uses less digits than its factorization.

8021806386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30299.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 8021806386 is about 89564.5375469555. The cubic root of 8021806386 is about 2001.8155502233.

The spelling of 8021806386 in words is "eight billion, twenty-one million, eight hundred six thousand, three hundred eighty-six".