7898741664840 has 384 divisors, whose sum is σ = 28079460864000. Its totient is φ = 1925409028608.

The previous prime is 7898741664797. The next prime is 7898741664857. The reversal of 7898741664840 is 484661478987.

7898741664840 is a `hidden beast` number, since 7 + 8 + 9 + 87 + 4 + 1 + 66 + 484 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 81416281 + ... + 81513239.

It is an arithmetic number, because the mean of its divisors is an integer number (73123596000).

Almost surely, 2^{7898741664840} 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 7898741664840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14039730432000).

7898741664840 is an abundant number, since it is smaller than the sum of its proper divisors (20180719199160).

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

7898741664840 is a wasteful number, since it uses less digits than its factorization.

7898741664840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97118 (or 97085 counting only the distinct ones).

The product of its (nonzero) digits is 520224768, while the sum is 72.

The spelling of 7898741664840 in words is "seven trillion, eight hundred ninety-eight billion, seven hundred forty-one million, six hundred sixty-four thousand, eight hundred forty".