8139861672 has 32 divisors (see below), whose sum is σ = 20369685600. Its totient is φ = 2710616384.

The previous prime is 8139861661. The next prime is 8139861679. The reversal of 8139861672 is 2761689318.

It is not an unprimeable number, because it can be changed into a prime (8139861679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141963 + ... + 190874.

It is an arithmetic number, because the mean of its divisors is an integer number (636552675).

Almost surely, 2^8139861672 is an apocalyptic number.

It is an amenable number.

8139861672 is an abundant number, since it is smaller than the sum of its proper divisors (12229823928).

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

8139861672 is a wasteful number, since it uses less digits than its factorization.

8139861672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333865 (or 333861 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 8139861672 is about 90221.1819474784. The cubic root of 8139861672 is about 2011.5878702973.

The spelling of 8139861672 in words is "eight billion, one hundred thirty-nine million, eight hundred sixty-one thousand, six hundred seventy-two".