8189866644 has 24 divisors (see below), whose sum is σ = 19113023328. Its totient is φ = 2729479200.

The previous prime is 8189866613. The next prime is 8189866667. The reversal of 8189866644 is 4466689818.

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, 15919 + ... + 128969.

It is an arithmetic number, because the mean of its divisors is an integer number (796375972).

Almost surely, 2^8189866644 is an apocalyptic number.

It is an amenable number.

8189866644 is an abundant number, since it is smaller than the sum of its proper divisors (10923156684).

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

8189866644 is a wasteful number, since it uses less digits than its factorization.

8189866644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119095 (or 119093 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 60.

The square root of 8189866644 is about 90497.8819862653. The cubic root of 8189866644 is about 2015.6986737453.

The spelling of 8189866644 in words is "eight billion, one hundred eighty-nine million, eight hundred sixty-six thousand, six hundred forty-four".