81818882 has 16 divisors (see below), whose sum is σ = 123858072. Its totient is φ = 40535040.

The previous prime is 81818879. The next prime is 81818887. The reversal of 81818882 is 28881818.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41229241 + 40589641 = 6421^2 + 6371^2 .

It is not an unprimeable number, because it can be changed into a prime (81818887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156782 + ... + 157302.

Almost surely, 2^81818882 is an apocalyptic number.

81818882 is a deficient number, since it is larger than the sum of its proper divisors (42039190).

81818882 is a wasteful number, since it uses less digits than its factorization.

81818882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its digits is 65536, while the sum is 44.

The square root of 81818882 is about 9045.3790412564. The cubic root of 81818882 is about 434.1280494550.

The spelling of 81818882 in words is "eighty-one million, eight hundred eighteen thousand, eight hundred eighty-two".