861113660 has 72 divisors (see below), whose sum is σ = 2038922928. Its totient is φ = 302956800.

The previous prime is 861113653. The next prime is 861113713. The reversal of 861113660 is 66311168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209384 + ... + 213456.

It is an arithmetic number, because the mean of its divisors is an integer number (28318374).

Almost surely, 2^861113660 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 861113660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019461464).

861113660 is an abundant number, since it is smaller than the sum of its proper divisors (1177809268).

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

861113660 is a wasteful number, since it uses less digits than its factorization.

861113660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155 (or 4122 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 861113660 is about 29344.7381995478. The cubic root of 861113660 is about 951.3788509228.

The spelling of 861113660 in words is "eight hundred sixty-one million, one hundred thirteen thousand, six hundred sixty".