818564 has 6 divisors (see below), whose sum is σ = 1432494. Its totient is φ = 409280.

The previous prime is 818561. The next prime is 818569. The reversal of 818564 is 465818.

818564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 448900 + 369664 = 670^2 + 608^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 818564.

It is not an unprimeable number, because it can be changed into a prime (818561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102317 + ... + 102324.

It is an arithmetic number, because the mean of its divisors is an integer number (238749).

2⁸¹⁸⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

818564 is a deficient number, since it is larger than the sum of its proper divisors (613930).

818564 is a wasteful number, since it uses less digits than its factorization.

818564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204645 (or 204643 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 818564 is about 904.7452680175. The cubic root of 818564 is about 93.5443468318.

The spelling of 818564 in words is "eight hundred eighteen thousand, five hundred sixty-four".