8211857208 has 64 divisors (see below), whose sum is σ = 21783168000. Its totient is φ = 2570829312.

The previous prime is 8211857201. The next prime is 8211857261. The reversal of 8211857208 is 8027581128.

It is a self number, because there is not a number n which added to its sum of digits gives 8211857208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8211857201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174423 + ... + 216441.

It is an arithmetic number, because the mean of its divisors is an integer number (340362000).

Almost surely, 2^8211857208 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 8211857208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10891584000).

8211857208 is an abundant number, since it is smaller than the sum of its proper divisors (13571310792).

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

8211857208 is a wasteful number, since it uses less digits than its factorization.

8211857208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42524 (or 42520 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 42.

The square root of 8211857208 is about 90619.2982095977. The cubic root of 8211857208 is about 2017.5011750645.

The spelling of 8211857208 in words is "eight billion, two hundred eleven million, eight hundred fifty-seven thousand, two hundred eight".