7878785728 has 56 divisors (see below), whose sum is σ = 18059089104. Its totient is φ = 3370598400.

The previous prime is 7878785713. The next prime is 7878785729. The reversal of 7878785728 is 8275878787.

It is not an unprimeable number, because it can be changed into a prime (7878785729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317193 + ... + 341128.

It is an arithmetic number, because the mean of its divisors is an integer number (322483734).

Almost surely, 2^7878785728 is an apocalyptic number.

It is an amenable number.

7878785728 is an abundant number, since it is smaller than the sum of its proper divisors (10180303376).

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

7878785728 is a wasteful number, since it uses less digits than its factorization.

7878785728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658361 (or 658351 counting only the distinct ones).

The product of its digits is 98344960, while the sum is 67.

The square root of 7878785728 is about 88762.5243444552. The cubic root of 7878785728 is about 1989.8473598233.

The spelling of 7878785728 in words is "seven billion, eight hundred seventy-eight million, seven hundred eighty-five thousand, seven hundred twenty-eight".