861187716 has 81 divisors (see below), whose sum is σ = 2240553861. Its totient is φ = 278904384.

The previous prime is 861187699. The next prime is 861187727. The reversal of 861187716 is 617781168.

It is a happy number.

The square root of 861187716 is 29346.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 488852100 + 372335616 = 22110^2 + 19296^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11797056 + ... + 11797128.

Almost surely, 2^861187716 is an apocalyptic number.

861187716 is the 29346-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861187716

861187716 is an abundant number, since it is smaller than the sum of its proper divisors (1379366145).

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

861187716 is a wasteful number, since it uses less digits than its factorization.

861187716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 145 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The cubic root of 861187716 is about 951.4061230843.

Multiplying 861187716 by its product of digits (112896), we get a square (97224648385536 = 9860256²).

The spelling of 861187716 in words is "eight hundred sixty-one million, one hundred eighty-seven thousand, seven hundred sixteen".