861380860 has 24 divisors (see below), whose sum is σ = 1814097600. Its totient is φ = 343562304.

The previous prime is 861380851. The next prime is 861380867. The reversal of 861380860 is 68083168.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861380867) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54724 + ... + 68683.

It is an arithmetic number, because the mean of its divisors is an integer number (75587400).

Almost surely, 2^861380860 is an apocalyptic number.

It is an amenable number.

861380860 is an abundant number, since it is smaller than the sum of its proper divisors (952716740).

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

861380860 is a wasteful number, since it uses less digits than its factorization.

861380860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123765 (or 123763 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 861380860 is about 29349.2906217510. The cubic root of 861380860 is about 951.4772437181.

The spelling of 861380860 in words is "eight hundred sixty-one million, three hundred eighty thousand, eight hundred sixty".