866989608 has 128 divisors (see below), whose sum is σ = 2370816000. Its totient is φ = 263278080.

The previous prime is 866989573. The next prime is 866989609. The reversal of 866989608 is 806989668.

866989608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (866989609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1476691 + ... + 1477277.

It is an arithmetic number, because the mean of its divisors is an integer number (18522000).

Almost surely, 2^866989608 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 866989608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185408000).

866989608 is an abundant number, since it is smaller than the sum of its proper divisors (1503826392).

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

866989608 is a wasteful number, since it uses less digits than its factorization.

866989608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 60.

The square root of 866989608 is about 29444.6872627304. The cubic root of 866989608 is about 953.5379098135.

Adding to 866989608 its sum of digits (60), we get a palindrome (866989668).

The spelling of 866989608 in words is "eight hundred sixty-six million, nine hundred eighty-nine thousand, six hundred eight".