7857676728 has 128 divisors (see below), whose sum is σ = 23899104000. Its totient is φ = 2372319360.

The previous prime is 7857676721. The next prime is 7857676741. The reversal of 7857676728 is 8276767587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7857676721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 652183 + ... + 664121.

It is an arithmetic number, because the mean of its divisors is an integer number (186711750).

Almost surely, 2^7857676728 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 7857676728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11949552000).

7857676728 is an abundant number, since it is smaller than the sum of its proper divisors (16041427272).

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

7857676728 is a wasteful number, since it uses less digits than its factorization.

7857676728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12242 (or 12232 counting only the distinct ones).

The product of its digits is 55319040, while the sum is 63.

The square root of 7857676728 is about 88643.5374294144. The cubic root of 7857676728 is about 1988.0686908050.

The spelling of 7857676728 in words is "seven billion, eight hundred fifty-seven million, six hundred seventy-six thousand, seven hundred twenty-eight".