7891403785920 has 168 divisors, whose sum is σ = 27155136559824. Its totient is φ = 2103444338688.

The previous prime is 7891403785841. The next prime is 7891403786003. The reversal of 7891403785920 is 295873041987.

7891403785920 is a `hidden beast` number, since 7 + 8 + 9 + 1 + 4 + 0 + 37 + 8 + 592 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5924622 + ... + 7133298.

It is an arithmetic number, because the mean of its divisors is an integer number (161637717618).

Almost surely, 2^{7891403785920} 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 7891403785920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13577568279912).

7891403785920 is an abundant number, since it is smaller than the sum of its proper divisors (19263732773904).

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

7891403785920 is a wasteful number, since it uses less digits than its factorization.

7891403785920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210967 (or 1210954 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 7891403785920 in words is "seven trillion, eight hundred ninety-one billion, four hundred three million, seven hundred eighty-five thousand, nine hundred twenty".