8641818 has 12 divisors (see below), whose sum is σ = 18723978. Its totient is φ = 2880600.

The previous prime is 8641817. The next prime is 8641819. The reversal of 8641818 is 8181468.

8641818 is a `hidden beast` number, since 8 + 641 + 8 + 1 + 8 = 666.

8641818 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8641817) and next prime (8641819).

It can be written as a sum of positive squares in only one way, i.e., 6985449 + 1656369 = 2643^2 + 1287^2 .

8641818 is a modest number, since divided by 1818 gives 864 as remainder.

It is not an unprimeable number, because it can be changed into a prime (8641817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 240033 + ... + 240068.

Almost surely, 2^8641818 is an apocalyptic number.

8641818 is an abundant number, since it is smaller than the sum of its proper divisors (10082160).

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

8641818 is a wasteful number, since it uses less digits than its factorization.

8641818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480109 (or 480106 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 8641818 is about 2939.6969231538. The cubic root of 8641818 is about 205.2115048894.

It can be divided in two parts, 86418 and 18, that added together give a square (86436 = 294²).

The spelling of 8641818 in words is "eight million, six hundred forty-one thousand, eight hundred eighteen".