861116544 has 48 divisors (see below), whose sum is σ = 2477955870. Its totient is φ = 287038464.

The previous prime is 861116539. The next prime is 861116549. The reversal of 861116544 is 445611168.

It is an interprime number because it is at equal distance from previous prime (861116539) and next prime (861116549).

It can be written as a sum of positive squares in only one way, i.e., 850305600 + 10810944 = 29160^2 + 3288^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 861116499 and 861116508.

It is not an unprimeable number, because it can be changed into a prime (861116549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 372597 + ... + 374900.

Almost surely, 2^861116544 is an apocalyptic number.

It is an amenable number.

861116544 is an abundant number, since it is smaller than the sum of its proper divisors (1616839326).

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

861116544 is a wasteful number, since it uses less digits than its factorization.

861116544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747517 (or 747502 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 861116544 is about 29344.7873394918. The cubic root of 861116544 is about 951.3799130255.

The spelling of 861116544 in words is "eight hundred sixty-one million, one hundred sixteen thousand, five hundred forty-four".