865190656 has 216 divisors, whose sum is σ = 2113921152. Its totient is φ = 351436800.

The previous prime is 865190653. The next prime is 865190657. The reversal of 865190656 is 656091568.

It is not an unprimeable number, because it can be changed into a prime (865190653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16324326 + ... + 16324378.

It is an arithmetic number, because the mean of its divisors is an integer number (9786672).

Almost surely, 2^865190656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865190656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056960576).

865190656 is an abundant number, since it is smaller than the sum of its proper divisors (1248730496).

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

865190656 is a wasteful number, since it uses less digits than its factorization.

865190656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 865190656 is about 29414.1234103619. The cubic root of 865190656 is about 952.8779416073.

The spelling of 865190656 in words is "eight hundred sixty-five million, one hundred ninety thousand, six hundred fifty-six".