861341872 has 20 divisors (see below), whose sum is σ = 1671573816. Its totient is φ = 429968000.

The previous prime is 861341869. The next prime is 861341903. The reversal of 861341872 is 278143168.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33754 + ... + 53497.

Almost surely, 2^861341872 is an apocalyptic number.

It is an amenable number.

861341872 is a deficient number, since it is larger than the sum of its proper divisors (810231944).

861341872 is a wasteful number, since it uses less digits than its factorization.

861341872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87876 (or 87870 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 861341872 is about 29348.6264073806. The cubic root of 861341872 is about 951.4628881810.

The spelling of 861341872 in words is "eight hundred sixty-one million, three hundred forty-one thousand, eight hundred seventy-two".