861106720 has 24 divisors (see below), whose sum is σ = 2034365004. Its totient is φ = 344442624.

The previous prime is 861106699. The next prime is 861106751. The reversal of 861106720 is 27601168.

It can be written as a sum of positive squares in 2 ways, for example, as 855211536 + 5895184 = 29244^2 + 2428^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690799 + ... + 2691118.

Almost surely, 2^861106720 is an apocalyptic number.

861106720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861106720 is an abundant number, since it is smaller than the sum of its proper divisors (1173258284).

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

861106720 is a wasteful number, since it uses less digits than its factorization.

861106720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381932 (or 5381924 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 861106720 is about 29344.6199498307. The cubic root of 861106720 is about 951.3762950902.

Adding to 861106720 its reverse (27601168), we get a palindrome (888707888).

The spelling of 861106720 in words is "eight hundred sixty-one million, one hundred six thousand, seven hundred twenty".