863647664 has 60 divisors (see below), whose sum is σ = 1870687560. Its totient is φ = 385862400.

The previous prime is 863647663. The next prime is 863647669. The reversal of 863647664 is 466746368.

It is not an unprimeable number, because it can be changed into a prime (863647663) 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 11 ways as a sum of consecutive naturals, for example, 110444 + ... + 118004.

It is an arithmetic number, because the mean of its divisors is an integer number (31178126).

Almost surely, 2^863647664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863647664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935343780).

863647664 is an abundant number, since it is smaller than the sum of its proper divisors (1007039896).

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

863647664 is a wasteful number, since it uses less digits than its factorization.

863647664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7650 (or 7633 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 50.

The square root of 863647664 is about 29387.8829451868. The cubic root of 863647664 is about 952.3111463242.

The spelling of 863647664 in words is "eight hundred sixty-three million, six hundred forty-seven thousand, six hundred sixty-four".