864554644 has 24 divisors (see below), whose sum is σ = 1595061440. Its totient is φ = 408893184.

The previous prime is 864554609. The next prime is 864554651. The reversal of 864554644 is 446455468.

It is a junction number, because it is equal to n+sod(n) for n = 864554594 and 864554603.

It is a congruent number.

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, 42697 + ... + 59599.

Almost surely, 2^864554644 is an apocalyptic number.

It is an amenable number.

864554644 is a deficient number, since it is larger than the sum of its proper divisors (730506796).

864554644 is a wasteful number, since it uses less digits than its factorization.

864554644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17599 (or 17597 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 46.

The square root of 864554644 is about 29403.3100857710. The cubic root of 864554644 is about 952.6443937125.

It can be divided in two parts, 86455464 and 4, that added together give a palindrome (86455468).

The spelling of 864554644 in words is "eight hundred sixty-four million, five hundred fifty-four thousand, six hundred forty-four".