864810544 has 40 divisors (see below), whose sum is σ = 1809536960. Its totient is φ = 398020608.

The previous prime is 864810533. The next prime is 864810589. The reversal of 864810544 is 445018468.

It is a junction number, because it is equal to n+sod(n) for n = 864810497 and 864810506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70672 + ... + 82000.

It is an arithmetic number, because the mean of its divisors is an integer number (45238424).

Almost surely, 2^864810544 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 864810544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904768480).

864810544 is an abundant number, since it is smaller than the sum of its proper divisors (944726416).

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

864810544 is a wasteful number, since it uses less digits than its factorization.

864810544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11717 (or 11711 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The square root of 864810544 is about 29407.6613146982. The cubic root of 864810544 is about 952.7383756849.

The spelling of 864810544 in words is "eight hundred sixty-four million, eight hundred ten thousand, five hundred forty-four".