861004644786 has 96 divisors (see below), whose sum is σ = 2264873640960. Its totient is φ = 240840436320.

The previous prime is 861004644761. The next prime is 861004644959. The reversal of 861004644786 is 687446400168.

861004644786 is a `hidden beast` number, since 8 + 6 + 100 + 4 + 64 + 478 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4983250 + ... + 5153133.

It is an arithmetic number, because the mean of its divisors is an integer number (23592433760).

Almost surely, 2^861004644786 is an apocalyptic number.

861004644786 is an abundant number, since it is smaller than the sum of its proper divisors (1403868996174).

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

861004644786 is a wasteful number, since it uses less digits than its factorization.

861004644786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10136429 (or 10136412 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 861004644786 in words is "eight hundred sixty-one billion, four million, six hundred forty-four thousand, seven hundred eighty-six".