8318591820 has 432 divisors, whose sum is σ = 32267289600. Its totient is φ = 1715293440.

The previous prime is 8318591807. The next prime is 8318591857. The reversal of 8318591820 is 281958138.

It is a happy number.

8318591820 is a `hidden beast` number, since 8 + 31 + 8 + 591 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 17366341 + ... + 17366819.

It is an arithmetic number, because the mean of its divisors is an integer number (74692800).

Almost surely, 2^8318591820 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 8318591820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16133644800).

8318591820 is an abundant number, since it is smaller than the sum of its proper divisors (23948697780).

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

8318591820 is a wasteful number, since it uses less digits than its factorization.

8318591820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 8318591820 is about 91206.3145840243. The cubic root of 8318591820 is about 2026.2044814137.

The spelling of 8318591820 in words is "eight billion, three hundred eighteen million, five hundred ninety-one thousand, eight hundred twenty".