861945180 has 48 divisors (see below), whose sum is σ = 2415114240. Its totient is φ = 229693248.

The previous prime is 861945179. The next prime is 861945197. The reversal of 861945180 is 81549168.

861945180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101457 + ... + 109623.

It is an arithmetic number, because the mean of its divisors is an integer number (50314880).

Almost surely, 2^861945180 is an apocalyptic number.

It is an amenable number.

861945180 is an abundant number, since it is smaller than the sum of its proper divisors (1553169060).

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

861945180 is a wasteful number, since it uses less digits than its factorization.

861945180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9938 (or 9936 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 861945180 is about 29358.9029086579. The cubic root of 861945180 is about 951.6849800982.

The spelling of 861945180 in words is "eight hundred sixty-one million, nine hundred forty-five thousand, one hundred eighty".