8315721792 has 420 divisors, whose sum is σ = 30201687120. Its totient is φ = 2249565696.

The previous prime is 8315721761. The next prime is 8315721823. The reversal of 8315721792 is 2971275138.

8315721792 is a `hidden beast` number, since 8 + 3 + 1 + 572 + 1 + 79 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (8315721761) and next prime (8315721823).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4825443 + ... + 4827165.

Almost surely, 2^8315721792 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 8315721792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15100843560).

8315721792 is an abundant number, since it is smaller than the sum of its proper divisors (21885965328).

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

8315721792 is a wasteful number, since it uses less digits than its factorization.

8315721792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1754 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 8315721792 is about 91190.5795134563. The cubic root of 8315721792 is about 2025.9714318531.

The spelling of 8315721792 in words is "eight billion, three hundred fifteen million, seven hundred twenty-one thousand, seven hundred ninety-two".