7991799552 has 504 divisors, whose sum is σ = 27747422640. Its totient is φ = 2269347840.

The previous prime is 7991799539. The next prime is 7991799553. The reversal of 7991799552 is 2559971997.

7991799552 is a `hidden beast` number, since 7 + 9 + 9 + 1 + 79 + 9 + 552 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 7991799552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991799553) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 34898574 + ... + 34898802.

It is an arithmetic number, because the mean of its divisors is an integer number (55054410).

Almost surely, 2^7991799552 is an apocalyptic number.

7991799552 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 7991799552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13873711320).

7991799552 is an abundant number, since it is smaller than the sum of its proper divisors (19755623088).

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

7991799552 is a wasteful number, since it uses less digits than its factorization.

7991799552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 262 counting only the distinct ones).

The product of its digits is 16074450, while the sum is 63.

The square root of 7991799552 is about 89396.8654484037. The cubic root of 7991799552 is about 1999.3163957025.

The spelling of 7991799552 in words is "seven billion, nine hundred ninety-one million, seven hundred ninety-nine thousand, five hundred fifty-two".