8391292816 has 15 divisors (see below), whose sum is σ = 16258839793. Its totient is φ = 4195463200.

The previous prime is 8391292799. The next prime is 8391292823. The reversal of 8391292816 is 6182921938.

The square root of 8391292816 is 91604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8245366416 + 145926400 = 90804^2 + 12080^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8391292816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 354966 + ... + 377866.

Almost surely, 2^8391292816 is an apocalyptic number.

8391292816 is the 91604-th square number.

It is an amenable number.

8391292816 is a deficient number, since it is larger than the sum of its proper divisors (7867546977).

8391292816 is an frugal number, since it uses more digits than its factorization.

8391292816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45810 (or 22903 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The cubic root of 8391292816 is about 2032.0900938106.

Multiplying 8391292816 by its sum of digits (49), we get a square (411173347984 = 641228²).

The spelling of 8391292816 in words is "eight billion, three hundred ninety-one million, two hundred ninety-two thousand, eight hundred sixteen".