863889664 has 81 divisors (see below), whose sum is σ = 1906837891. Its totient is φ = 390325760.

The previous prime is 863889641. The next prime is 863889707. The reversal of 863889664 is 466988368.

The square root of 863889664 is 29392.

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

863889664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863889599 and 863889608.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5172909 + ... + 5173075.

Almost surely, 2^863889664 is an apocalyptic number.

863889664 is the 29392-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863889664

863889664 is an abundant number, since it is smaller than the sum of its proper divisors (1042948227).

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

863889664 is an equidigital number, since it uses as much as digits as its factorization.

863889664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 180 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 58.

The cubic root of 863889664 is about 952.4000860562.

The spelling of 863889664 in words is "eight hundred sixty-three million, eight hundred eighty-nine thousand, six hundred sixty-four".