7678856784 has 80 divisors (see below), whose sum is σ = 20119337280. Its totient is φ = 2523402240.

The previous prime is 7678856777. The next prime is 7678856807. The reversal of 7678856784 is 4876588767.

It is a congruent number.

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, 1249399 + ... + 1255529.

It is an arithmetic number, because the mean of its divisors is an integer number (251491716).

Almost surely, 2^7678856784 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 7678856784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10059668640).

7678856784 is an abundant number, since it is smaller than the sum of its proper divisors (12440480496).

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

7678856784 is a wasteful number, since it uses less digits than its factorization.

7678856784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6508 (or 6502 counting only the distinct ones).

The product of its digits is 126443520, while the sum is 66.

The square root of 7678856784 is about 87629.0864040017. The cubic root of 7678856784 is about 1972.8717583182.

The spelling of 7678856784 in words is "seven billion, six hundred seventy-eight million, eight hundred fifty-six thousand, seven hundred eighty-four".