818281818 has 32 divisors (see below), whose sum is σ = 1827947520. Its totient is φ = 271329120.

The previous prime is 818281817. The next prime is 818281819. The reversal of 818281818 is 818182818.

It is an interprime number because it is at equal distance from previous prime (818281817) and next prime (818281819).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (818281817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29355 + ... + 49982.

It is an arithmetic number, because the mean of its divisors is an integer number (57123360).

Almost surely, 2^818281818 is an apocalyptic number.

818281818 is an abundant number, since it is smaller than the sum of its proper divisors (1009665702).

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

818281818 is a wasteful number, since it uses less digits than its factorization.

818281818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79539 (or 79533 counting only the distinct ones).

The product of its digits is 65536, while the sum is 45.

The square root of 818281818 is about 28605.6256355284. The cubic root of 818281818 is about 935.3359647517.

It can be divided in two parts, 8182 and 81818, that added together give a square (90000 = 300²).

The spelling of 818281818 in words is "eight hundred eighteen million, two hundred eighty-one thousand, eight hundred eighteen".