3861781544 has 32 divisors (see below), whose sum is σ = 7301923200. Its totient is φ = 1914669120.

The previous prime is 3861781543. The next prime is 3861781579. The reversal of 3861781544 is 4451871683.

It is not an unprimeable number, because it can be changed into a prime (3861781543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486197 + ... + 494075.

It is an arithmetic number, because the mean of its divisors is an integer number (228185100).

Almost surely, 2^3861781544 is an apocalyptic number.

It is an amenable number.

3861781544 is a deficient number, since it is larger than the sum of its proper divisors (3440141656).

3861781544 is a wasteful number, since it uses less digits than its factorization.

3861781544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393 (or 8389 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 3861781544 is about 62143.2340967221. The cubic root of 3861781544 is about 1568.9023043633.

The spelling of 3861781544 in words is "three billion, eight hundred sixty-one million, seven hundred eighty-one thousand, five hundred forty-four".