7881991304 has 144 divisors (see below), whose sum is σ = 17314245900. Its totient is φ = 3358713600.

The previous prime is 7881991303. The next prime is 7881991319. The reversal of 7881991304 is 4031991887.

It can be written as a sum of positive squares in 2 ways, for example, as 6151264900 + 1730726404 = 78430^2 + 41602^2 .

It is not an unprimeable number, because it can be changed into a prime (7881991303) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 34419062 + ... + 34419290.

Almost surely, 2^7881991304 is an apocalyptic number.

7881991304 is a gapful number since it is divisible by the number (74) 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 7881991304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8657122950).

7881991304 is an abundant number, since it is smaller than the sum of its proper divisors (9432254596).

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

7881991304 is a wasteful number, since it uses less digits than its factorization.

7881991304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 7881991304 is about 88780.5795430510. The cubic root of 7881991304 is about 1990.1171874459.

The spelling of 7881991304 in words is "seven billion, eight hundred eighty-one million, nine hundred ninety-one thousand, three hundred four".