3891536644 has 12 divisors (see below), whose sum is σ = 6955087104. Its totient is φ = 1904368904.

The previous prime is 3891536617. The next prime is 3891536653. The reversal of 3891536644 is 4466351983.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10349644 + ... + 10350019.

It is an arithmetic number, because the mean of its divisors is an integer number (579590592).

Almost surely, 2^3891536644 is an apocalyptic number.

It is an amenable number.

3891536644 is a deficient number, since it is larger than the sum of its proper divisors (3063550460).

3891536644 is a wasteful number, since it uses less digits than its factorization.

3891536644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20699714 (or 20699712 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The square root of 3891536644 is about 62382.1821035462. The cubic root of 3891536644 is about 1572.9214733774.

The spelling of 3891536644 in words is "three billion, eight hundred ninety-one million, five hundred thirty-six thousand, six hundred forty-four".