866733858 has 48 divisors (see below), whose sum is σ = 1955169216. Its totient is φ = 287770320.

The previous prime is 866733827. The next prime is 866733893. The reversal of 866733858 is 858337668.

It is a happy number.

866733858 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 (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124428 + ... + 131208.

It is an arithmetic number, because the mean of its divisors is an integer number (40732692).

Almost surely, 2^866733858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866733858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977584608).

866733858 is an abundant number, since it is smaller than the sum of its proper divisors (1088435358).

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

866733858 is a wasteful number, since it uses less digits than its factorization.

866733858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7061 (or 7049 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 866733858 is about 29440.3440536961. The cubic root of 866733858 is about 953.4441404068. Note that the first 3 decimals are identical.

The spelling of 866733858 in words is "eight hundred sixty-six million, seven hundred thirty-three thousand, eight hundred fifty-eight".