866723538 has 8 divisors (see below), whose sum is σ = 1733447088. Its totient is φ = 288907844.

The previous prime is 866723537. The next prime is 866723567. The reversal of 866723538 is 835327668.

866723538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

866723538 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (866723537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72226956 + ... + 72226967.

It is an arithmetic number, because the mean of its divisors is an integer number (216680886).

Almost surely, 2^866723538 is an apocalyptic number.

866723538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

866723538 is a wasteful number, since it uses less digits than its factorization.

866723538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144453928.

The product of its digits is 1451520, while the sum is 48.

The square root of 866723538 is about 29440.1687834836. The cubic root of 866723538 is about 953.4403562453.

The spelling of 866723538 in words is "eight hundred sixty-six million, seven hundred twenty-three thousand, five hundred thirty-eight".