7991488512 has 624 divisors, whose sum is σ = 29004265472. Its totient is φ = 2149908480.

The previous prime is 7991488471. The next prime is 7991488513. The reversal of 7991488512 is 2158841997.

It is a happy number.

7991488512 is a `hidden beast` number, since 79 + 91 + 488 + 5 + 1 + 2 = 666.

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

Its product of digits (1451520) is a multiple of the sum of its prime divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991488513) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 215986158 + ... + 215986194.

Almost surely, 2^7991488512 is an apocalyptic number.

7991488512 is a gapful number since it is divisible by the number (72) 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 7991488512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14502132736).

7991488512 is an abundant number, since it is smaller than the sum of its proper divisors (21012776960).

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

7991488512 is an equidigital number, since it uses as much as digits as its factorization.

7991488512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 80 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 7991488512 is about 89395.1257731651. The cubic root of 7991488512 is about 1999.2904576379.

The spelling of 7991488512 in words is "seven billion, nine hundred ninety-one million, four hundred eighty-eight thousand, five hundred twelve".