3886649649 has 21 divisors (see below), whose sum is σ = 5829833563. Its totient is φ = 2589977592.

The previous prime is 3886649581. The next prime is 3886649651. The reversal of 3886649649 is 9469466883.

The square root of 3886649649 is 62343.

It is a perfect power (a square), and thus also a powerful number.

3886649649 is a `hidden beast` number, since 3 + 88 + 66 + 496 + 4 + 9 = 666.

3886649649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3242505249 + 644144400 = 56943^2 + 25380^2 .

It is not a de Polignac number, because 3886649649 - 2²⁹ = 3349778737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3886649449) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 1682107 + ... + 1684415.

Almost surely, 2^3886649649 is an apocalyptic number.

3886649649 is the 62343-rd square number.

3886649649 is the 31172-nd centered octagonal number.

It is an amenable number.

3886649649 is a deficient number, since it is larger than the sum of its proper divisors (1943183914).

3886649649 is an frugal number, since it uses more digits than its factorization.

3886649649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636 (or 2312 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 63.

The cubic root of 3886649649 is about 1572.2627721969.

The spelling of 3886649649 in words is "three billion, eight hundred eighty-six million, six hundred forty-nine thousand, six hundred forty-nine".