864206321 has 8 divisors (see below), whose sum is σ = 950563488. Its totient is φ = 785640900.

The previous prime is 864206269. The next prime is 864206353. The reversal of 864206321 is 123602468.

It is a de Polignac number, because none of the positive numbers 2^k-864206321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (864206381) 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 7 ways as a sum of consecutive naturals, for example, 323315 + ... + 325976.

It is an arithmetic number, because the mean of its divisors is an integer number (118820436).

Almost surely, 2^864206321 is an apocalyptic number.

It is an amenable number.

864206321 is a deficient number, since it is larger than the sum of its proper divisors (86357167).

864206321 is an equidigital number, since it uses as much as digits as its factorization.

864206321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649324 (or 649302 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 864206321 is about 29397.3862953835. The cubic root of 864206321 is about 952.5164386129.

Adding to 864206321 its reverse (123602468), we get a palindrome (987808789).

The spelling of 864206321 in words is "eight hundred sixty-four million, two hundred six thousand, three hundred twenty-one".