3878665728 has 160 divisors (see below), whose sum is σ = 11892334080. Its totient is φ = 1100390400.

The previous prime is 3878665699. The next prime is 3878665733. The reversal of 3878665728 is 8275668783.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1622358 + ... + 1624746.

It is an arithmetic number, because the mean of its divisors is an integer number (74327088).

Almost surely, 2^3878665728 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 3878665728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5946167040).

3878665728 is an abundant number, since it is smaller than the sum of its proper divisors (8013668352).

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

3878665728 is a wasteful number, since it uses less digits than its factorization.

3878665728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568 (or 2552 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 60.

The square root of 3878665728 is about 62278.9348656510. The cubic root of 3878665728 is about 1571.1854581415.

The spelling of 3878665728 in words is "three billion, eight hundred seventy-eight million, six hundred sixty-five thousand, seven hundred twenty-eight".