8391791350404 has 288 divisors, whose sum is σ = 27449890003200. Its totient is φ = 2170162368000.

The previous prime is 8391791350403. The next prime is 8391791350441. The reversal of 8391791350404 is 4040531971938.

8391791350404 is a `hidden beast` number, since 8 + 3 + 9 + 179 + 13 + 50 + 404 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (8391791350403) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20747704 + ... + 21148304.

Almost surely, 2^{8391791350404} is an apocalyptic number.

8391791350404 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8391791350404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13724945001600).

8391791350404 is an abundant number, since it is smaller than the sum of its proper divisors (19058098652796).

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

8391791350404 is a wasteful number, since it uses less digits than its factorization.

8391791350404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400872 (or 400853 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 8391791350404 in words is "eight trillion, three hundred ninety-one billion, seven hundred ninety-one million, three hundred fifty thousand, four hundred four".