8391991896 has 96 divisors (see below), whose sum is σ = 24696422400. Its totient is φ = 2564602560.

The previous prime is 8391991849. The next prime is 8391991897. The reversal of 8391991896 is 6981991938.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8391991897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56536 + ... + 141351.

It is an arithmetic number, because the mean of its divisors is an integer number (257254400).

Almost surely, 2^8391991896 is an apocalyptic number.

It is an amenable number.

8391991896 is an abundant number, since it is smaller than the sum of its proper divisors (16304430504).

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

8391991896 is a wasteful number, since it uses less digits than its factorization.

8391991896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197949 (or 197942 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 63.

The square root of 8391991896 is about 91607.8156927672. The cubic root of 8391991896 is about 2032.1465234981.

The spelling of 8391991896 in words is "eight billion, three hundred ninety-one million, nine hundred ninety-one thousand, eight hundred ninety-six".