3871408644 has 18 divisors (see below), whose sum is σ = 9786060830. Its totient is φ = 1290469536.

The previous prime is 3871408601. The next prime is 3871408661. The reversal of 3871408644 is 4468041783.

It can be written as a sum of positive squares in only one way, i.e., 3023900100 + 847508544 = 54990^2 + 29112^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 3871408644.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53769529 + ... + 53769600.

Almost surely, 2^3871408644 is an apocalyptic number.

It is an amenable number.

3871408644 is an abundant number, since it is smaller than the sum of its proper divisors (5914652186).

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

3871408644 is a wasteful number, since it uses less digits than its factorization.

3871408644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107539139 (or 107539134 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 3871408644 is about 62220.6448375457. The cubic root of 3871408644 is about 1570.2049368028.

The spelling of 3871408644 in words is "three billion, eight hundred seventy-one million, four hundred eight thousand, six hundred forty-four".