8491371776 has 72 divisors (see below), whose sum is σ = 18134776800. Its totient is φ = 3956152320.

The previous prime is 8491371743. The next prime is 8491371787. The reversal of 8491371776 is 6771731948.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282395 + ... + 311013.

It is an arithmetic number, because the mean of its divisors is an integer number (251871900).

Almost surely, 2^8491371776 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 8491371776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9067388400).

8491371776 is an abundant number, since it is smaller than the sum of its proper divisors (9643405024).

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

8491371776 is a wasteful number, since it uses less digits than its factorization.

8491371776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28715 (or 28701 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 53.

The square root of 8491371776 is about 92148.6395775868. The cubic root of 8491371776 is about 2040.1367792436.

The spelling of 8491371776 in words is "eight billion, four hundred ninety-one million, three hundred seventy-one thousand, seven hundred seventy-six".