3866720447868 has 24 divisors (see below), whose sum is σ = 9022461665280. Its totient is φ = 1288890536880.

The previous prime is 3866720447851. The next prime is 3866720447879. The reversal of 3866720447868 is 8687440276683.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025148 + ... + 2963843.

It is an arithmetic number, because the mean of its divisors is an integer number (375935902720).

Almost surely, 2^{3866720447868} is an apocalyptic number.

It is an amenable number.

3866720447868 is an abundant number, since it is smaller than the sum of its proper divisors (5155741217412).

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

3866720447868 is a wasteful number, since it uses less digits than its factorization.

3866720447868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069777 (or 4069775 counting only the distinct ones).

The product of its (nonzero) digits is 520224768, while the sum is 69.

The spelling of 3866720447868 in words is "three trillion, eight hundred sixty-six billion, seven hundred twenty million, four hundred forty-seven thousand, eight hundred sixty-eight".