7999779996 has 120 divisors (see below), whose sum is σ = 22564445904. Its totient is φ = 2456801280.

The previous prime is 7999779979. The next prime is 7999780057. The reversal of 7999779996 is 6999779997.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2698411 + ... + 2701373.

Almost surely, 2^7999779996 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 7999779996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11282222952).

7999779996 is an abundant number, since it is smaller than the sum of its proper divisors (14564665908).

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

7999779996 is a wasteful number, since it uses less digits than its factorization.

7999779996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633 (or 3622 counting only the distinct ones).

The product of its digits is 1093705578, while the sum is 81.

The square root of 7999779996 is about 89441.4892317877. The cubic root of 7999779996 is about 1999.9816661653.

Subtracting from 7999779996 its reverse (6999779997), we obtain a palindrome (999999999).

The spelling of 7999779996 in words is "seven billion, nine hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred ninety-six".