865000800729 has 48 divisors (see below), whose sum is σ = 1360491804672. Its totient is φ = 526426677504.

The previous prime is 865000800707. The next prime is 865000800821. The reversal of 865000800729 is 927008000568.

It is not a de Polignac number, because 865000800729 - 2¹¹ = 865000798681 is a prime.

It is a super-2 number, since 2×865000800729² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865000800529) 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 47 ways as a sum of consecutive naturals, for example, 4557874 + ... + 4743860.

It is an arithmetic number, because the mean of its divisors is an integer number (28343579264).

Almost surely, 2^865000800729 is an apocalyptic number.

It is an amenable number.

865000800729 is a deficient number, since it is larger than the sum of its proper divisors (495491003943).

865000800729 is a wasteful number, since it uses less digits than its factorization.

865000800729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186446 (or 186443 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 865000800729 in words is "eight hundred sixty-five billion, eight hundred thousand, seven hundred twenty-nine".