866065728 has 112 divisors (see below), whose sum is σ = 2521183680. Its totient is φ = 262366720.

The previous prime is 866065721. The next prime is 866065729. The reversal of 866065728 is 827560668.

866065728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866065721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253858 + ... + 257246.

Almost surely, 2^866065728 is an apocalyptic number.

866065728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866065728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260591840).

866065728 is an abundant number, since it is smaller than the sum of its proper divisors (1655117952).

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

866065728 is a wasteful number, since it uses less digits than its factorization.

866065728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437 (or 3405 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 866065728 is about 29428.9946821158. The cubic root of 866065728 is about 953.1990869480.

The spelling of 866065728 in words is "eight hundred sixty-six million, sixty-five thousand, seven hundred twenty-eight".