7861804739880 has 256 divisors, whose sum is σ = 29032281169920. Its totient is φ = 1658521322496.

The previous prime is 7861804739869. The next prime is 7861804739923. The reversal of 7861804739880 is 889374081687.

It is a Cunningham number, because it is equal to 2803891²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84070029 + ... + 84163491.

It is an arithmetic number, because the mean of its divisors is an integer number (113407348320).

Almost surely, 2^{7861804739880} is an apocalyptic number.

7861804739880 is a gapful number since it is divisible by the number (70) 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 7861804739880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14516140584960).

7861804739880 is an abundant number, since it is smaller than the sum of its proper divisors (21170476430040).

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

7861804739880 is a wasteful number, since it uses less digits than its factorization.

7861804739880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101200 (or 101196 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 69.

The spelling of 7861804739880 in words is "seven trillion, eight hundred sixty-one billion, eight hundred four million, seven hundred thirty-nine thousand, eight hundred eighty".