864544 has 12 divisors (see below), whose sum is σ = 1702134. Its totient is φ = 432256.

The previous prime is 864541. The next prime is 864551. The reversal of 864544 is 445468.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 374544 = 700^2 + 612^2 .

It is not an unprimeable number, because it can be changed into a prime (864541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13477 + ... + 13540.

2⁸⁶⁴⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

864544 is a deficient number, since it is larger than the sum of its proper divisors (837590).

864544 is a wasteful number, since it uses less digits than its factorization.

864544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027 (or 27019 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The square root of 864544 is about 929.8085824512. The cubic root of 864544 is about 95.2640484190.

The spelling of 864544 in words is "eight hundred sixty-four thousand, five hundred forty-four".