7991748540 has 144 divisors (see below), whose sum is σ = 25089232896. Its totient is φ = 2056982400.

The previous prime is 7991748539. The next prime is 7991748581. The reversal of 7991748540 is 458471997.

7991748540 is a `hidden beast` number, since 7 + 9 + 91 + 7 + 4 + 8 + 540 = 666.

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 47 ways as a sum of consecutive naturals, for example, 2403319 + ... + 2406641.

It is an arithmetic number, because the mean of its divisors is an integer number (174230784).

Almost surely, 2^7991748540 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 7991748540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12544616448).

7991748540 is an abundant number, since it is smaller than the sum of its proper divisors (17097484356).

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

7991748540 is a wasteful number, since it uses less digits than its factorization.

7991748540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800 (or 3795 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The square root of 7991748540 is about 89396.5801359314. The cubic root of 7991748540 is about 1999.3121417860.

The spelling of 7991748540 in words is "seven billion, nine hundred ninety-one million, seven hundred forty-eight thousand, five hundred forty".