7997178816 has 448 divisors, whose sum is σ = 26852636160. Its totient is φ = 2312478720.

The previous prime is 7997178701. The next prime is 7997178887. The reversal of 7997178816 is 6188717997.

It is a congruent number.

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, 58373500 + ... + 58373636.

It is an arithmetic number, because the mean of its divisors is an integer number (59938920).

Almost surely, 2^7997178816 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 7997178816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13426318080).

7997178816 is an abundant number, since it is smaller than the sum of its proper divisors (18855457344).

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

7997178816 is a wasteful number, since it uses less digits than its factorization.

7997178816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 273 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 63.

The square root of 7997178816 is about 89426.9468113499. The cubic root of 7997178816 is about 1999.7648736922.

The spelling of 7997178816 in words is "seven billion, nine hundred ninety-seven million, one hundred seventy-eight thousand, eight hundred sixteen".