864708430609 has 3 divisors (see below), whose sum is σ = 864709360507. Its totient is φ = 864707500712.

The previous prime is 864708430601. The next prime is 864708430657. The reversal of 864708430609 is 906034807468.

The square root of 864708430609 is 929897.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3761982225 + 860946448384 = 61335^2 + 927872^2 .

It is not a de Polignac number, because 864708430609 - 2³ = 864708430601 is a prime.

It is a super-2 number, since 2×864708430609² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 864708430609.

It is not an unprimeable number, because it can be changed into a prime (864708430601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 464949 + ... + 1394845.

Almost surely, 2^864708430609 is an apocalyptic number.

864708430609 is the 929897-th square number.

864708430609 is the 464949-th centered octagonal number.

It is an amenable number.

864708430609 is a deficient number, since it is larger than the sum of its proper divisors (929898).

864708430609 is an frugal number, since it uses more digits than its factorization.

864708430609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859794 (or 929897 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 864708430609 in words is "eight hundred sixty-four billion, seven hundred eight million, four hundred thirty thousand, six hundred nine".