7866329856 has 432 divisors, whose sum is σ = 27469790208. Its totient is φ = 1974067200.

The previous prime is 7866329851. The next prime is 7866329869. The reversal of 7866329856 is 6589236687.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7866329856.

It is not an unprimeable number, because it can be changed into a prime (7866329851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12832206 + ... + 12832818.

Almost surely, 2^7866329856 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 7866329856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13734895104).

7866329856 is an abundant number, since it is smaller than the sum of its proper divisors (19603460352).

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

7866329856 is a wasteful number, since it uses less digits than its factorization.

7866329856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 667 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 60.

The square root of 7866329856 is about 88692.3325660116. The cubic root of 7866329856 is about 1988.7981982864.

The spelling of 7866329856 in words is "seven billion, eight hundred sixty-six million, three hundred twenty-nine thousand, eight hundred fifty-six".