818168728 has 32 divisors (see below), whose sum is σ = 1739026800. Its totient is φ = 357740928.

The previous prime is 818168699. The next prime is 818168749. The reversal of 818168728 is 827861818.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205051 + ... + 209002.

Almost surely, 2^818168728 is an apocalyptic number.

It is an amenable number.

818168728 is an abundant number, since it is smaller than the sum of its proper divisors (920858072).

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

818168728 is a wasteful number, since it uses less digits than its factorization.

818168728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414091 (or 414087 counting only the distinct ones).

The product of its digits is 344064, while the sum is 49.

The square root of 818168728 is about 28603.6488581440. The cubic root of 818168728 is about 935.2928736409.

The spelling of 818168728 in words is "eight hundred eighteen million, one hundred sixty-eight thousand, seven hundred twenty-eight".