818689668 has 24 divisors (see below), whose sum is σ = 1921999968. Its totient is φ = 271221696.

The previous prime is 818689667. The next prime is 818689679. The reversal of 818689668 is 866986818.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (818689661) 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, 207321 + ... + 211232.

It is an arithmetic number, because the mean of its divisors is an integer number (80083332).

Almost surely, 2^818689668 is an apocalyptic number.

It is an amenable number.

818689668 is an abundant number, since it is smaller than the sum of its proper divisors (1103310300).

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

818689668 is a wasteful number, since it uses less digits than its factorization.

818689668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418723 (or 418721 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 60.

The square root of 818689668 is about 28612.7535899640. The cubic root of 818689668 is about 935.4913364112.

The spelling of 818689668 in words is "eight hundred eighteen million, six hundred eighty-nine thousand, six hundred sixty-eight".