861039449088 has 352 divisors, whose sum is σ = 2831722199040. Its totient is φ = 226514534400.

The previous prime is 861039449063. The next prime is 861039449111. The reversal of 861039449088 is 880944930168.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 117128613 + ... + 117135963.

Almost surely, 2^861039449088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861039449088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415861099520).

861039449088 is an abundant number, since it is smaller than the sum of its proper divisors (1970682749952).

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

861039449088 is a wasteful number, since it uses less digits than its factorization.

861039449088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7813 (or 7795 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 60.

The spelling of 861039449088 in words is "eight hundred sixty-one billion, thirty-nine million, four hundred forty-nine thousand, eighty-eight".