7871540784 has 80 divisors (see below), whose sum is σ = 20855188992. Its totient is φ = 2556981504.

The previous prime is 7871540779. The next prime is 7871540813. The reversal of 7871540784 is 4870451787.

It is a super-2 number, since 2×7871540784² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 951514 + ... + 959750.

Almost surely, 2^7871540784 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 7871540784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10427594496).

7871540784 is an abundant number, since it is smaller than the sum of its proper divisors (12983648208).

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

7871540784 is a wasteful number, since it uses less digits than its factorization.

7871540784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8754 (or 8748 counting only the distinct ones).

The product of its (nonzero) digits is 1756160, while the sum is 51.

The square root of 7871540784 is about 88721.7041315145. The cubic root of 7871540784 is about 1989.2372508421.

The spelling of 7871540784 in words is "seven billion, eight hundred seventy-one million, five hundred forty thousand, seven hundred eighty-four".